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C Program to Calculate Grade of Student



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In this article, you will learn and get code about finding the grade of student on the basis of marks entered (in 5 subjects) by user (at run-time). The grade system will be applied as shown in the table given below:

Mark Range Grade
91-100 A1
81-90 A2
71-80 B1
61-70 B2
51-60 C1
41-50 C2
33-40 D
21-32 E1
0-20 E2

Here mark range is the average mark range. That is, if a student got 78, 74, 80, 72, 76 marks in all the 5 subjects, so the average of these marks will be 76 and 76 lies between 71-80. So the grade will be B1.

Note - If average mark of a student is 90.4, then his/her grade will be A2.

Student Grade Program in C

The question is, write a program in C that asks from user to enter marks obtained in 5 subjects to calculate and print his/her grade based on the average marks. The answer to this question is given below:

#include<stdio.h>
#include<conio.h>
int main()
{
    int i;
    float mark, sum=0, avg;
    printf("Enter Marks obtained in 5 Subjects: ");
    for(i=0; i<5; i++)
    {
        scanf("%f", &mark);
        sum = sum+mark;
    }
    avg = sum/5;
    printf("\nGrade = ");
    if(avg>=91 && avg<=100)
        printf("A1");
    else if(avg>=81 && avg<91)
        printf("A2");
    else if(avg>=71 && avg<81)
        printf("B1");
    else if(avg>=61 && avg<71)
        printf("B2");
    else if(avg>=51 && avg<61)
        printf("C1");
    else if(avg>=41 && avg<51)
        printf("C2");
    else if(avg>=33 && avg<41)
        printf("D");
    else if(avg>=21 && avg<33)
        printf("E1");
    else if(avg>=0 && avg<21)
        printf("E2");
    else
        printf("Invalid!");
    getch();
    return 0;
}

This program is compiled and executed in Code::Blocks IDE. Here is the snapshot of sample run:

c program calculate student grade

Now supply any 5 input as marks of 5 subjects say 91.5, 90, 83, 92, 95 and press ENTER key to see the output as given in the following snapshot:

student grade program c

The above program finds grade of a student using if-else statements. To learn about if-else in detail, refer to if if-else else in C tutorial.

Here is the modified version of the above program. In this program, we have allowed the user to entered number of subject, and then to enter marks obtained in all subjects as shown in the program given below:

#include<stdio.h>
#include<conio.h>
int main()
{
    int i, n;
    float m, sum=0, a;
    printf("How many Subject runs in your Institute ? ");
    scanf("%d", &n);
    printf("\nEnter marks obtained in %d Subjects: ", n);
    for(i=0; i<n; i++)
    {
        scanf("%f", &m);
        sum = sum+m;
    }
    a = sum/n;
    printf("\nGrade = ");
    if(a>=91 && a<=100)
        printf("A1");
    else if(a>=81 && a<91)
        printf("A2");
    else if(a>=71 && a<81)
        printf("B1");
    else if(a>=61 && a<71)
        printf("B2");
    else if(a>=51 && a<61)
        printf("C1");
    else if(a>=41 && a<51)
        printf("C2");
    else if(a>=33 && a<41)
        printf("D");
    else if(a>=21 && a<33)
        printf("E1");
    else if(a>=0 && a<21)
        printf("E2");
    else
        printf("Invalid!");
    getch();
    return 0;
}

The sample run of the above program is shown in the snapshot given below:

c student grade program

Same Program in Other Languages

C Online Test


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