#include<stdio.h>
main()
{
int eng,math,n=2;
float average;
printf("Enter your english test mark.");
scanf("%d",&eng);
while(eng<0)
{
printf("Wrong number!Enter again.");
}
printf("Enter your Mathematics test mark.");
scanf("%d",&math);
while(math<0)
{
printf("Wrong number!Enter again.");
}
average=(math+eng)/2;
printf("Your average mark is %f",average);
