swap two float variables via xor

FloatSwap.cc

#include <cstdio>

void swap(int & a, int & b)
{
    a = a ^ b;
    b = a ^ b;
    a = a ^ b;
}

int main()
{
    float a = 1.1, b = 2.3;
    swap(*(int*)&a, *(int*)&b);
    printf("%f\t%f\n", a, b); 
    return 0;
}