C program to calculate simple interest

#include<stdio.h>
#include<conio.h>


void main()
{

float p,r,t,si;
clrscr(); //to clear the screen
printf("Enter principal,rate and time;");
scanf("%f%f%f",&p,&r,&t);
si=(p*r*t)/100;
printf("\nSI=%f",si);
getch(); //to stop the screen
}