Print total marks and percentage

#include<stdio.h>
#include<conio.h>
{
clrscr();
int p,c,m;
printf("Enter physics marks:");
scanf("%d",&p);
printf("Enter physics marks:");
scanf("%d",&c);
printf("Enter physics marks:");
scanf("%d",&m);
int sum=p+c+m;
float per=sum/3;
printf("Total marks = %d",sum);
printf("Percentage = %f",per);getch();
}