Calculate Average C

The example how to calculate Average Using C programming:

Example the question ask you to display the average of mark key in by the user/student and based on the input display the grade, and the average mark :-


    average      grade
 At least 80       A
 60 – 79            B
 50 – 59            C
Less than 50      F

 Source Code:
#include <stdio.h>

int main(){
int i;
float num[3],
sum=0.0,average;

printf("--------------------------\n ");
printf("  STUDENT DETAILS \n");
printf("--------------------------- \n\n");


for(i=0; i<3 ; i++)
   {
        printf("Enter mark: %d :",i+1);
        scanf("%f",&num[i]);
        sum+=num[i]; }

        average=sum/3;

        printf("\nAverage = %.2f",average);
        if(average >= 80)
{
printf("\nGrade = A\n");
}
else if(average >= 60 && average <= 79)
        {
            printf("\nGrade = B\n");
        }
        else if(average >=50 && average <=59)
        {
            printf("\nGrade = C\n");
        }
        else
        {
            printf("\nGrade = F\n");
        }

        return 0;
    }