Swap structure values

Assume that you have a structure defined as follow 
struct two_integers {int n1;int n2;};
and this structure is initialized as follow
struct two_integers x={100,-100}; 
Write a C function that returns the same structure x but n1 and n2 are swapped

	#include <stdio.h>
	struct two_integers {int n1;int n2;};
	void swap(struct two_integers *xp)// pass structure variable by reference
	{
	int t=xp->n1;
	xp->n1=xp->n2;
	xp->n2=t;
	return;
	}
	int main()
	{
	struct two_integers x={100,-100};// n1=100 and n2=-100;
	struct two_integers *xp=&x;
	swap(xp);
	printf("n1=%d\tn2=%d\n",x.n1,x.n2);
	return 0;
	}

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