Is MethodChannel buffering messages until the other side is "connected"? On the other hand, in order to address more than 4GB of memory (that 32bit systems can do), you need your pointers to be 8 bytes wide. >My OS in 64-bit but pointer size is 4 bit. In general, your code should not care what the pointer size may be, nor relay on that the pointers of different type are the same size. How to change the input parameters of Command Line in MFC C++ application, How to create a custom control in a dialog with ATL, Windows Portable device event monitoring using MFC C++. If you do this, then your code will work perfectly and compile cleanly on both 32- and 64-bit platforms. (64 bit) and by that sizeof int should be 8? There are only two integer types that could be smaller than int: char and short. The size of a pointer in C/C++ is not fixed. Using flutter mobile packages in flutter web. Why does the distance from light to subject affect exposure (inverse square law) while from subject to lens does not? The pointer in a program compiled as 64-bit is 8 bytes (64 bits). One such common programming model is ILP32 (Microsoft Windows, 32-bit Linux) where the size of an integer, long and pointer are all 32 bits. Another alternative is the ILP64 data model in What properties should my fictional HEAT rounds have to punch through heavy armor and ERA? build a Win32 program the pointers will be 32 bits. Your system can have characters default to sizes other . If you. Jan 24 '06 # 10. video tutorial meaning. CGAC2022 Day 10: Help Santa sort presents! int* just holds the address to "somewhere in memory", and you can't address more than 4GB of memory with just 32 bits. Understanding sizeof(char) in 32 bit C compilers. C allows for all sorts of possibilities. The first time you compile this code for 64-bit Windows, the compiler might generate many pointer-truncation or type-mismatch warnings. # 4 06-04-2009 blowtorch Registered User 2,351, 6 Mathematica cannot find square roots of some matrices? On 32-bit compiler both int & long has 4 bytes size. "/> . Why isn't it so? It looks like the program was compiled as 32 bit? "long long integer" type, which is at least 64 bits on all platforms, Usually it depends upon the word size of underlying processor for example for a 32 bit computer the pointer size can be 4 bytes for a 64 bit computer the pointer size can be 8 bytes. For example, a pointer on a 64-bit system will be 64-bits, which is 8 bytes. You have correctly calculated the 64 bit machine/8 bits per byte --> 8 byte pointer. Is energy "equal" to the curvature of spacetime? Why is sizeof ( char ) 1 in 32 bit C? There are only two integer types that could be smaller than int: char and short. So, I thought about printing the following: and the result was 4, which seemed weird (since it is a 64 bit machine), Since I'm using a 64 bit machine, shouldn't a primitive type such as int should use 8 bytes. Let us confirm that with the following code. Explain the concept of Array of Pointer and Pointer to Pointer in C programming. What does the C++ standard state the size of int, long type to be? It is int which causes the greatest confusion. //BAD //GOOD. This means that a pointer to an extern type is identical to a raw pointer. Another In fact, any kind of pointer we consider i.e. straightforward, and many well-written programs can simply be recompiled for the new environment without changes. or 16 bits size of int: 4 bytes. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. If int was 64 bits, then you couldn't have all three of the sizes 8, 16 and 32 bits. Means the same as above. Hmmm). 64-bit machines, "int" variables are still 32 bits wide, but long dst . integers and pointers are 64 bits wide. On the other hand, in order to address more than 4GB of memory (that 32bit systems can do), you need your pointers to be 8 bytes wide. CSHIFT Circular shift elements of an array# CSHIFT (ARRAY, SHIFT, DIM) #. [citation needed] However, in etc.. How much data a char * can point to is theoretically . What does dereferencing a pointer mean in C/C++? It is commonly referred to as the 4/8/8 data type size model and includes the integer/long/pointer type sizes, measured in bytes. size is for which platform you have built your program. Note: Memory for code, constant data, stack, dynamic data, various data types, etc. The most common operating systems (Windows, Linux, macOS) use the LP64 and LLP64 data models, where int is 32-bit. Current Visibility: Visible to the original poster & Microsoft, Viewable by moderators and the original poster. There is no standard language syntax for specifying mixed pointer size. Note: This code is executed on a 64-bit processor. or 8 bits size of char16_t: 2 bytes. alternative is the LLP64 model, which maintains compatibility with Size of a pointer should be 8 byte on any 64-bit C/C++ compiler, but the same is not true for the size of int. In practice, pointers will be size 2 on a 16-bit system (if you can find one), 4 on a 32-bit system, and 8 on a 64-bit system, but there's nothing to be gained in relying on a given size. etc.. How much data a char * can point to is theoretically infinite. There are only two integer types that could be smaller than int: char and short. Solution 1. sizeof (char) is always 1. However if the program is compiled as 32 bit, then the pointer is 4 bytes (32 bits). So, I thought what could be the reason for that ? What is the size of void pointer in C/C++? It depends upon different issues like Operating system, CPU architecture etc. About the only C requirement is that they be at least 16 bits (or so) - other than that, it compiler dependent for the sizeof(int), sizeof(int*). >My OS in 64-bit but pointer size is 4 bit. Usually it depends upon the word size of underlying processor for example for a 32 bit computer the pointer size can be 4 bytes for a 64 bit computer the pointer size can be 8 bytes. (it is a 64). Actually, whatever are pointer types, that store only address of the variables they point to, whatever it is int . It depends upon different issues like Operating system, CPU architecture etc. That's why compilers tend to make int = 32 bits, so you can have char = 8 bit, short = 16 bit, int = 32 bit, long long = 64 bit and long = 32 bit or 64 bit. The size of long data type changes on 64 bit compiler. Is `sizeof(char*)` always equal to `sizeof(double*)`? Always. 9,208 Expert Mod 8TB. which all three data types are 64 bits wide, and even SILP64 where What should be the data type for unsigned char* ???? including 32-bit environments. char types sizes size of char: 1 bytes. The size of a char * is probably 4 bytes on a 32-bit machine and 8 bytes on a 64-bit machine, etc. "long long integer" type, which is at least 64 bits on all platforms, an LP64 data model. In general a 32-bit computer machine then size of a pointer would be 4 bytes while for a 64-bit computer machine, it would be 8 bytes. int esp_app_get_elf_sha256 (char * dst, size_t size) . Join Bytes to post your question to a community of 471,633 software developers and data experts. In 64-bit data models, pointer sizes are always 64 bits. /// The upper bound on 64-bit currently needs to be lower because LLVM uses a 64-bit integer /// to represent object size in bits. Not the answer you're looking for? What determines the pointersize is for which platform you have built your program. Some people are certain that an int has 16 bits and sizeof (int) is 2. LP64 is short for long-pointer 64. 32-bit code by leaving both int and long as 32-bit. Why does the USA not have a constitutional court? Toggle Comment visibility. Consider a compiler where int takes 4 bytes, char takes 1 byte and pointer takes 4 bytes. Pointer in C is just a variable that could store the address of the other variable. I was just wondering how can I know if my laptop is 64 or 32 bit machine. If you mean the length (size would be a more appropriate term) of a.character pointer then just use 'sizeof (char*)'.For the length of a. string pointed to by the character pointer use 'strlen'. If int was 64 bits, then you couldn't have all three of the sizes 8, 16 and 32 bits. #, "aruna" wrote in message. If the size is less than 64-bit, sizeof word > 1 and multiple chars can be stored in a word (the word can be aliased with an array of char). Parameters. because I thought if (int *) is taking 8 bytes, then (char *) should take lesser value. although the c++ standard actually allows compilers some flexibility, the following sizes are typical: 1 byte (8 bits) 2 bytes (16 bits) 4 bytes note that in 64-bit mode, types long and int have different sizes and ranges; a long always has the same size as a pointer.a pointer (or addr ess) has 64-bit r epresentation in 64-bit mode and 32-bit How is a character stored in a word aligned machine? most cases the modifications required are relatively minor and Another alternative is the ILP64 data model in Asking for help, clarification, or responding to other answers. 64-bit machines, "int" variables are still 32 bits wide, but long Do an experiment with your current setup. CSHIFT(ARRAY, SHIFT [, DIM]) performs a circular shift on elements of ARRAY along the dimension of DIM.If DIM is omitted it is taken to be 1. int esp_app_get_elf_sha256 (char * dst, size_t size) Fill the provided buffer with SHA256 of the ELF file, formatted as hexadecimal, null-terminated. Learn more. CinziaG Casting be more like length = strlen((char *)arrayPointer); Don't do that. So, I thought what could be the reason for that ? If the buffer size is not sufficient to fit the entire SHA256 in hex plus a null terminator, the largest possible number of bytes will be written followed by a . Size of int and sizeof int pointer on a 64 bit machine, en.wikipedia.org/wiki/64-bit_computing#64-bit_data_models. I read in 64-bit OS pointer is 8-byte. could exist in separate implied, Does this mean it's more memory efficient to use. That's why all are elements of arrPtr are initialized implicitly to ZERO i.e. Wikipedia has a good explanation on that: In many programming environments for C and C-derived languages on Instead, make sure that you have #include <string.h> somewhere earlier in your C source file (outside any function body) to ensure that a prototype is in scope, that length is of a type that is guaranteed to be able to hold the value returned (for example, if you can guarantee the largest value returned will be . Connect and share knowledge within a single location that is structured and easy to search. The minimum size for char is 8 bits, the minimum size for short and int is 16 bits, for long it is 32 bits and long long must contain at least 64 bits. To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page. Arithmetic may only be performed on integers in D programs. I was just wondering how can I know if my laptop is 64 or 32 bit machine. These are described as having Another correct answer is b. (it is a 64). In the normal case, the size of the pointer is determined by the architecture of the platform your compiler is running on. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. The only exception is exotic systems with the SILP64 data model, where the size of int is also 64 bits. So, I think if I will run it on 64-bit machine, then it would give 64 bits, so that's why it is giving 64/8 bytes as answer, but I am not sure ! If the system is 16-bit, size of void pointer is 2 bytes. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. SetWindowLong -> SetWindowLongPtr. On ABIs other than the x86-64 psABI they select the same CPU features as the x86-64 psABI documents for the particular micro-architecture level. On the other hand, in order to address more than 4GB of memory (that 32bit systems can do), you need your pointers to be 8 bytes wide. The "size of a structure pointer" refers to the sizeof the struct variable the pointer points at. How to change background color of Stepper widget to transparent color? could exist in separate implied, Does this mean it's more memory efficient to use. Which C++ questions belong here or on Visual Studio Developer Community? By using this website, you agree with our Cookies Policy. Certificate Top instructor. Why is int typically 32 bit on 64 bit compilers? Another common programming model is LP64 (64-bit Linux) where the size of an integer is 32 bits but the size of a long and a pointer is 64 bits. Thanks for contributing an answer to Stack Overflow! Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. or 32 bits size of long: 8 bytes. Wikipedia has a good explanation on that: In many programming environments for C and C-derived languages on Putting a 64-bit pointer into a 32-bit variable causes the cutting of high-order bits, and therefore incorrect program behavior. Enjoy unlimited access on 5500+ Hand Picked Quality Video Courses. Sometimes you read: "a pointer is as big as the object it points at". Data Types and Sizes D provides fundamental data types for integers and floating-point constants. @UdbhavKalra A pointer to one type is very commonly the same size as the pointer to another type. So, I think if I will run it on 64-bit machine, then it would give 64 bits, so that's why it is giving 64/8 bytes as answer, but I am not sure ! 'x86-64-v2' 'x86-64-v3' 'x86-64-v4' These choices for cpu-typeselect the corresponding micro-architecture level from the x86-64 psABI. The Ptr part of the function names is misleading. When a common size is needed, use, TabBar and TabView without Scaffold and with fixed Widget. We make use of First and third party cookies to improve our user experience. compiler as well. So for a specific architecture pointer size will be fixed. 32bit machines use a 32bit pointer (4 bytes) max address range is 4 gigabytes. For extern types the metadata is simply `()`. size of pointers in c language Can we keep alcoholic beverages indefinitely? DIM is a scalar of type INTEGER in the range of 1 leq DIM leq n) where n is the rank of ARRAY.If the rank of ARRAY is one, then all elements of ARRAY are shifted by SHIFT places. sizeof unsigned int in microsoft x64-compiler, Finding the size of an array of strings in C++. Is it illegal to use resources in a University lab to prove a concept could work (to ultimately use to create a startup). To subscribe to this RSS feed, copy and paste this URL into your RSS reader. A pointer is a variable that stores the memory address of whatever type it is designed to point at. It is irrelevant how the architecture stores a char, but to compiler, you must reference chars 1 byte at a time, even if they use up less than 1 byte. Size of a pointer should be 8 byte on any 64-bit C/C++ compiler, but the same is not true for the size of int. recompiled for the new environment without changes. Find centralized, trusted content and collaborate around the technologies you use most. If int was 64 bits, then you couldn't have all three of the sizes 8, 16 and 32 bits. On 32 bit platform Size of void* is 4 byte. *s1 == *(s1+0) == s1[0] == char If you want to get size of a character pointer, you need to pass a character pointer to sizeof: sizeof(&s1[0]);. What is the size of float and double in C and C++? What is the difference between const int*, const int * const, and int const *? Then the size of the char array is find by dividing the size of the complete array by the size of the first variable. No, the sizeof(int) is implementation defined, and is usually 4 bytes. Start Learning. In C size of a pointer is not fixed as it depends on Word size of the processor. @UdbhavKalra Why do you think it should not be 8? Your operating system is not relevant. That's why compilers tend to make int = 32 bits, so you can have char = 8 bit, short = 16 bit, int = 32 bit, long long = 64 bit and long = 32 bit or 64 bit. "Stephen Sprunk" writes: Thomas Stegen writes: In article <2a******************************@news.teranews.co m> "Stephen Sprunk" writes: In article <63**************************@posting.google.com >, In , ElasticJob 3.0.2 is released including failover optimization, scheduling stability, and Java 19 compatibility, Knapsack 0-1 Python binary & rosettacode & WE, How to create a 3D snake game with Javascript (attached source code and game link), Commercial load balancer in place of HAproxy for Postgres HA. rev2022.12.11.43106. The sizeof(int), sizeof(int*), and "machine size", though often correlated to each other, can each be independently smaller, the same or larger than the others. So for a specific architecture pointer size will be fixed. or 64 bits So, I thought about printing the following: and the result was 4, which seemed weird (since it is a 64 bit machine), Since I'm using a 64 bit machine, shouldn't a primitive type such as int should use 8 bytes. It is common to all data types like int *, float * etc. Size of a pointer is fixed for a compiler. In Rust, pointers to DSTs carry metadata about the object being pointed to. A pointer, regardless of 'char*', 'int*' 'struct mystruct *', is the same size. Your computer can still address each byte individually - that's what the sizeof operator is telling you about. Size of int and sizeof int pointer on a 64 bit machine. a Win64 program the pointers will be 64 bits. After you convert your 32-bit driver source code to use the new data types, you can use the 64-bit compiler to identify any type-related problems that you initially missed. If the buffer size is not sufficient to fit the entire SHA256 in hex plus a null terminator, the largest possible number of bytes will be written followed by a null. Post by Saurabh Aggrawal In 64 bit AMD programming the data type unsigned INT_PTR (unsigned int*) is UINT_PTR and for unsigned LONG_PTR (unsigned long*) is ULONG_PTR. About the only C requirement is that they be at least 16 bits (or so) - other than that, it compiler dependent for the sizeof(int), sizeof(int*). Solution 1. What are the differences between a pointer variable and a reference variable? (Although maybe a pointer must be at least an int size. My work as a freelance was used in a scientific paper, should I be included as an author? Why isn't it so? or 64 bits size of long long: 8 bytes. You should display it with %zu, %u or %lu instead of %d. MFC C++ application: how to clear command line arguments in Task Manager? Now considering the 64-bit system, Size of int is 4 Bytes Size of character is 1 Byte Size of any pointer type is 8 Bytes (Pointer size doesn't depend on what kind of data type they are pointing too) So the size of the struct should be: (4+8+1+8)=21 Bytes Let's see what compiler is giving using the sizeof () operator. If the system is 32-bit, size of void pointer is 4 bytes. The data type for an unsigned char* is "unsigned char*". If you build a Win64 program the pointers will be 64 bits. This allows great flexibility: for example, all types can be 64-bit. Differentiate the NULL pointer with Void pointer in C language. The size of a char * is probably 4 bytes on a 32-bit machine and 8 bytes on a 64-bit machine, etc. Disconnect vertical tab connector from PCB. @user2672165 It might. "short" integers are also 64 bits wide. whenComplete() method not working as expected - Flutter Async, iOS app crashes when opening image gallery using image_picker. There are only two integer types that could be smaller than int: char and short. Did neanderthals need vitamin C from the diet? Problem with implementing a function to reverse a linked list in C, Size of object containing reference variable. # [inline] What is a smart pointer and when should I use one? Is it correct to say "The glue on the back of the sticker is dying down so I can not stick the sticker to the wall"? (Although maybe a pointer must be at least an int size. including 32-bit environments. No, its not possible to specify pointer size. For strings and slices this is the length of the buffer, for trait objects this is the object's vtable. Because size of a char is guaranteed to be 1 byte by the C standard. "short" integers are also 64 bits wide. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Attachments: Up to 10 attachments (including images) can be used with a maximum of 3.0 MiB each and 30.0 MiB total. Agree When should i use streams vs just accessing the cloud firestore once in flutter? or 32 bits integer types (signed) sizes size of char: 1 bytes. If youbuild a Win32 program the pointers will be 32 bits. Here is an example to find the size of void pointer in C language, Example Live Demo 2. I'm afraid I don't see what you're saying. Hebrews 1:3 What is the Relationship Between Jesus and The Word of His Power? [citation needed] However, in long int on some platforms will be 32 or 64 bit on a 32 vs 64 bit host, Note: Memory for code, constant data, stack, dynamic data, various data types, etc. Programmers like to have integer types of 1, 2, 4 and 8 bytes or 8, 16, 32 and 64 bits. Explain the concept of pointer to pointer and void pointer in C language? Replace every single instance of Windows calls that pass pointers as mystery meat with the Ptr versions. To learn more, see our tips on writing great answers. Why does my stock Samsung Galaxy phone/tablet lack some features compared to other Samsung Galaxy models? Only address/pointer length. If the system is 64-bit, size of void pointer is 8 bytes. On any given compiler, one or the other could be right. Here arrPtr is a global array of pointers to int. It should be noted that global variables such arrPtr are initialized to ZERO. #, Nov 14 '05 64 bit architecture does not alter the integer model compared to 32 bit. then, why does sizeof(char*) also gives "8" in some cases ? which all three data types are 64 bits wide, and even SILP64 where There is only one known architecture with 64-bit word addressing (no octet-based addressing) where C was implemented: the Cray vector Ready to optimize your JavaScript with Rust? int* just holds the address to "somewhere in memory", and you can't address more than 4GB of memory with just 32 bits. the compiler will make them whatever the cpu requires them to be. integers and pointers are 64 bits wide. Since it is a pointer to a memory location, it stores the value of that memory location (it's address). What is difference between a pointer and reference parameter in C++? The 'block size' you're talking about is just the native word size of the machine - usually the size that will result in most efficient operation. Making statements based on opinion; back them up with references or personal experience. These are described as having alternative is the LLP64 model, which maintains compatibility with The type int should be the integer type that the target processor is most efficiently working with. When you malloc () memory, all you know is that you're getting a block of memory that is contiguous (or NULL if the allocation failed). straightforward, and many well-written programs can simply be No, the sizeof(int) is implementation defined, and is usually 4 bytes. If you build. My OS in 64-bit but pointer size is 4 bit. LP64 is the 64-bit data model chosen by the Aspen working group (formed by X/OPEN and a consortium of hardware vendors). What is the size of column of int(11) in mysql in bytes? Why is Singapore currently considered to be a dictatorial regime and a multi-party democracy by different publications? When you do sizeof (int), it returns 4 to . Your operating system is not relevant. because I thought if (int *) is taking 8 bytes, then (char *) should take lesser value. "LL" refers to the How do I set, clear, and toggle a single bit? 32-bit code by leaving both int and long as 32-bit. Replies have been disabled for this discussion. Pointer to esp_app_desc structure. e.g. or 8 bits size of short: 2 bytes. The size of void pointer varies system to system. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. or 16 bits size of char32_t: 4 bytes. How to check if widget is visible using FlutterDriver. Jul 19, 2021 at 9:11am. I just tested sizeof(int *) (char *), on my platform it was giving 8 only. When you increment a structure pointer, the address in the pointer is incremented by the sizeof the struct. At what point in the prequels is it revealed that Palpatine is Darth Sidious? Assuming on 64bit, Nov 14 '05 By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use. Many modern processors can handle different word sizes with equal ease. In the below program, to find the size of the char variable and char array: first, the char variable is defined in charType and the char array in arr. That's why compilers tend to make int = 32 bits, so you can have char = 8 bit, short = 16 bit, int = 32 bit, long long = 64 bit and long = 32 bit or 64 bit. Is it safe to delete a void pointer in C/C++? Size of Double Pointer in C. As we already know, the size of pointer in C is machine-dependent, so the size of the double-pointer should be the same as that of the character-pointer. But, pointer is just an address. Image Processing: Algorithm Improvement for 'Coca-Cola Can' Recognition, Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_u64 on Intel CPUs. int , char or float etc. (64 bit) and by that sizeof int should be 8? What determines the pointer. Explanation: Size of an array is number of elements multiplied by the type of element, that is why we get sizeof arri as 12 and sizeof arrc as 3. Then, the size of the char variable is calculated using sizeof () operator. It would need to be 1 << 61 to account for this, but is /// currently conservatively bounded to 1 << 47 as that is enough to cover the current usable /// address space on 64-bit ARMv8 and x86_64. A generic CPU with 64-bit extensions. That's why compilers tend to make int = 32 bits, so you can have char = 8 bit, short = 16 bit, int = 32 bit, long long = 64 bit and long = 32 bit or 64 bit. How to find the size of an array (from a pointer pointing to the first element array)? GetWindowLong -> GetWindowLongPtr. I just tested sizeof(int *) (char *), on my platform it was giving 8 only. jonnin (11076) pointers are more or less directly hitting an offset in your system's ram. Hmmm). sizeof empty structure is 0 in C and 1 in C++ why? 1 Answer. But, pointer is just an address. Thus, a "char pointer" is designed to point-at a character. 64bit machines use a 64bit pointer (8 bytes) max address range is 16 exbibytes. The sizeof(int), sizeof(int*), and "machine size", though often correlated to each other, can each be independently smaller, the same or larger than the others. an LP64 data model. However, it might be necessary to specify the size of a pointer type to help migrate a 32-bit application (for example, when libraries share a common header between 32-bit and 64-bit applications). How would you create a standalone widget from this widget tree? Where does the idea of selling dragon parts come from? then, why does sizeof(char*) also gives "8" in some cases ? all have same size and size could be 4 bytes or 8 bytes depend upon platform we are using i.e.32 bit or 64 bit etc. If int was 64 bits, then you couldn't have all three of the sizes 8, 16 and 32 bits. Having said that, pointers to intrinsic data and to objects should always be the same size on a given architecture. "LL" refers to the 16bit machines use a 16bit pointer (2 bytes) max address range is 64KB. Size of int and sizeof int pointer on a 64 bit machine c++cint64-bitsizeof 86,674 Solution 1 No, the sizeof(int)is implementation defined, and is usually 4 bytes. How do I arrange multiple quotations (each with multiple lines) vertically (with a line through the center) so that they're side-by-side? Whereas in 64-bit, it changes to 4 & 8 bytes. Are defenders behind an arrow slit attackable? most cases the modifications required are relatively minor and Others are equally sure that an int has 32 bits and sizeof (int) is 4. Who is right? Affordable solution to train a team and make them project ready. Floating-point constants may be used to initialize data structures, but floating-point arithmetic is not permitted in D. D provides a 32-bit and 64-bit data model for use in writing programs. Connecting three parallel LED strips to the same power supply. Fill the provided buffer with SHA256 of the ELF file, formatted as hexadecimal, null-terminated. So, possible sizes of char on a 64-bit machine are: 8, 16, 32 and 64-bit. The size of the character pointer is 8 bytes. Programmers like to have integer types of 1, 2, 4 and 8 bytes or 8, 16, 32 and 64 bits. @UdbhavKalra Why do you think it should not be 8? Now run sizeof on them. 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