#include <stdio.h>
#include <stdlib.h>
#include <time.h>
void fn(void* p1, void* p2,int len){
char* pc1 = (char*)p1;
char* pc2 = (char*)p2;
char temp;
int i;
for(i=0;i<len;i++){
temp = *pc1;
*pc1 = *pc2;
*pc2 = temp;
pc1++;
pc2++;
}
}
int main() {
int a = 100;
int b = 200;
fn(&a,&b,sizeof(int));
printf("%d,%d",a,b);
return 0;
}