Thread: HOWTO swap sturct or union?

sturct or union is given. how to swap it? exchange each data???

Code:

#include <stdio.h>
typedef struct {
	int k;
	int s;
	int f;
}sfType;

void exchange(int *x, int *y)
{
	int t = *x;
	*x = *y;
	*y = t;
}

void exchangeSF(sfType *sf1, sfType *sf2)
{
	exchange(&sf1.k, &sf2.k);
	exchange(&sf1.s, &sf2.s);
	exchange(&sf1.f, &sf2.f);
}
...........
int main()
{.........}

GCC said that It wasn't a structure or union in exchange(&sf1.k, &sf2.k), exchange(&sf1.s, &sf2.s) and exchange(&sf1.f &sf2.f);