Question

How to count the size and number of elements array in windows with C

Answer 1

#include <windows.h>
#include <stdio.h>
#include <stdlib.h> 

int main() {
    char buffer[10];
    
    printf("sizeof(buffer) = %zu bytes\n", sizeof(buffer));
    printf("_countof(buffer) = %zu elements\n", _countof(buffer));

    TCHAR arr[20];

    printf("sizeof(arr) = %zu bytes\n", sizeof(arr));
    printf("_countof(arr) = %zu elements\n", _countof(arr));

    WCHAR s[30];

    printf("sizeof(s) = %zu bytes\n", sizeof(s));
    printf("_countof(s) = %zu elements\n", _countof(s));

    char ch = getchar();

    return 0;
}
 



/*
run:

sizeof(buffer) = 10 bytes
_countof(buffer) = 10 elements
sizeof(arr) = 40 bytes
_countof(arr) = 20 elements
sizeof(s) = 60 bytes
_countof(s) = 30 elements

*/

 

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