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swap two float variables via xor
#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;
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