Swap in C

swap.c

#include <stdio.h>

void swap(float *p1,float *p2){
    float tmp;
    tmp=*p1;
    *p1=*p2;
    *p2=tmp;
    
    printf("p1=%f , p2=%f\n",p1,p2);
}

int main(){
    float f1=2.5,f2=8.1;
    swap(&f1,&f2);
    printf("f1=%f, f2=%f\n",f1,f2);


}