C PROGRAMMING -- SIMPLE INTEREST USING POINTER

#include<stdio.h>
#include<conio.h>
void main()
{       clrscr();
int p,r,t;
printf("enter the principal,rate,time\n");
scanf("%d\t%d\t%d",&p,&r,&t);
float si;
int *a=&p,*b=&r,*c=&t;
float *d=&si;
*d=(*a)*(*b)*(*c)/100;
printf("simple interest=%f",*d);
getch();
}