sizeof() showing different output

sizeof() showing different output

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sizeof() showing different output
Tag : c , By : druta
Date : November 29 2020, 01:01 AM

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What is the sizeof(main), sizeof(printf), sizeof(scanf)?

Tag : c , By : SachinJadhav
Date : March 29 2020, 07:55 AM
this one helps. In the gcc compiler, sizeof(main), sizeof(printf) and sizeof(scanf) all are 1. I want to know how the size of all these are 1. What is the logic behind it? , Because the C(99) standard requires (ยง6.5.3.4/1)
4187     if (type_code == FUNCTION_TYPE)
4188       {
4189         if (is_sizeof)
4190           {
4191             if (complain && (pedantic || warn_pointer_arith))
4192               pedwarn (loc, pedantic ? OPT_pedantic : OPT_Wpointer_arith,
4193                        "invalid application of %<sizeof%> to a function type");
4194             else if (!complain)
4195               return error_mark_node;
4196             value = size_one_node;
4197           }
4198         else
4199           value = size_int (FUNCTION_BOUNDARY / BITS_PER_UNIT);
4200       }
4201     else if (type_code == VOID_TYPE || type_code == ERROR_MARK)
4202       {
4203         if (type_code == VOID_TYPE
4204             && complain && (pedantic || warn_pointer_arith))
4205           pedwarn (loc, pedantic ? OPT_pedantic : OPT_Wpointer_arith,
4206                    "invalid application of %qs to a void type", op_name);
4207         else if (!complain)
4208           return error_mark_node;
4209         value = size_one_node;
4210       } 

C/C++: sizeof(short), sizeof(int), sizeof(long), sizeof(long long), etc... on a 32-bit machine versus on a 64-bit machin

Tag : cpp , By : PPD
Date : March 29 2020, 07:55 AM
This might help you Looks right to me. In c/c++ int isn't specifically defined in terms of bit-size. When creating a project you can select a "console application". VS2012 still supports C, but they mostly lump projects into C/C++. There is a compiler option (/TC I think) which will force the compiler into C compliance. By default it will imply the language by the file extension. MS C support isn't ideal, it doesn't include stdbool.h for instance.
If you want to control the bit size of your data you can use stdint.h which contains exact width int datatypes.

sizeof not showing the expected output

Tag : c , By : markku
Date : March 29 2020, 07:55 AM

Where in the C++ Standard does it say that sizeof(wchar_t) <= sizeof(long) and sizeof(bool) <= sizeof(long)?

Tag : cpp , By : brennen
Date : March 29 2020, 07:55 AM

Marshal.SizeOf of a structure showing wrong output

Tag : chash , By : Hans-Inge
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , It's showing 8 because of structure member alignment rules.
If you want to set your struct as unaligned, you need to use StructLayout with the Pack = 1 attribute like so:
[StructLayout(LayoutKind.Sequential, Pack = 1)]
struct abc
    short a;
    byte b;
    int c;
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