knr/printswap.c

#include <stdio.h>
        void swap(void *v[], int, int);
int main()
{
	char a[2];
	a[1]='a';
	a[0]='b';
	swap(a,0,1);
	printf("%c",a[0]);
	printf("%c",a[1]);

return 0;
}

   void swap(void *v[],  int i, int j)
   {
       void *temp;

       temp = v[i];
       v[i] = v[j];
       v[j] = temp;
   }