编辑代码

# include  <stdio.h>

// #define ID replacement list



int main()
{
    int a=12,b=3;
    //^=异或
    a ^= b;
    printf("%d\n",a);
    b ^= a;
    printf("%d\n",b);
    a ^= b;
    printf("%d\n",a);
    printf("%d --- %d",a,b);
    return 0;
}