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判断机器是大端小端

2024-07-28 22:30:30   219人阅读

#include <stdio.h>
#include <stdbool.h>
#if 0
bool isBigEndian(void)
{
    int var = 0x12345678;
    char *p = (char *)&var;
    return *p == 0x12;
}
#endif


#if 0
bool isLittleEndian(void)
{
    int var = 1;
    char *p = (char *)&var;
    return *p == 1;
}


#else


bool isLittleEndian(void)
{
    union {
        char c;
        int d;
    } endian = {0};


    endian.c = 1;


    return endian.d;
}


#endif
int main(void)
{
    //printf("Your CPU is \"%s\"!\n", isBigEndian() ? "Big Endian" : "Little Endian");
    printf("Your CPU is \"%s\"!\n", isLittleEndian() ? "Little Endian" : "Big Endian");


    return 0;
}

判断机器是大端小端


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