Average of four numbers

#include<stdio.h>
#include<math.h>
int main()
//Average of four numbers
{
    int a,b,c,d,sum;
    float avg;
    printf("Enter four numbers : \n");
    scanf(" %d %d %d %d",&a,&b,&c,&d);
    sum=a+b+c+d;
    avg=(float)sum/4;
    printf("sum=%d\n",sum);
    printf("Average =%.2f",avg);

    return 0;

}