Question

How to set code to compiled in 64 bit only or in 32 bit only using macro in windows with C

Answer 1

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

int main(void)
{
    SYSTEM_INFO si;

    GetNativeSystemInfo(&si);

    #ifdef _WIN64
        printf("64: Processor Mask: 0x%016llX\n", si.dwActiveProcessorMask);
        printf("64 bit\n");
    #else
        printf("32: Processor Mask: 0x%08X\n", si.dwActiveProcessorMask);
        printf("32 bit\n");
    #endif

    char ch = getchar();

    return 0;
}
 



/*
run:

64: Processor Mask: 0x00000000000000FF
64 bit

*/

 

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