C Program to Enter Marks of Five Subjects and Calculate Percentage and Grade

In this article, you will learn how to find the Total, Average, Percentage, and Grade values of the marks of five subjects in the c language.

 

Example

 

You should have the knowledge of the following topics in c programming to understand this program:

• C Functions
• C main() function
• C printf() function

 

Standard Formula

Total = marks1 + marks2 + marks3 + marks4 + marks5

Average = Total / 5.0

Percentage = (Total / 500.0) x 100

 

Where marks1, marks2, marks3, marks4, and marks5 are the marks of five subjects.

 

In this article, we solve this problem in five methods:

1. Using the If-else ladder
2. Using the Switch Case
3. Using the function
4. Using the nested If-else ladder
5. Using the conditional operator

C Program to Find Grade of a Student Using If else Ladder

// C Program to Find Grade of a Student Using If else Ladder
#include <stdio.h>

int main() {
    float subject_1, subject_2, subject_3, subject_4, subject_5;
    float total, average, percentage;
    char grade;

    printf("Enter the marks of five subjects::\n");
    scanf("%f%f%f%f%f", &subject_1, &subject_2, &subject_3, &subject_4, &subject_5);

    // It will calculate the Total, Average and Percentage
    total = subject_1 + subject_2 + subject_3 + subject_4 + subject_5;
    average = total / 5.0;
    percentage = (total / 500.0) * 100;

    // It will calculate the Grade
    if (average >= 90)
        grade = 'A';
    else if (average >= 80 && average < 90)
        grade = 'B';
    else if (average >= 70 && average < 80)
        grade = 'C';
    else if (average >= 60 && average < 70)
        grade = 'D';
    else
        grade = 'E';

    // It will produce the final output
    printf("\nThe Total marks is:  \t%.2f / 500.00\n", total);
    printf("\nThe Average marks is:\t%.2f\n", average);
    printf("\nThe Percentage is:   \t%.2f%%\n", percentage);
    printf("\nThe Grade is:        \t'%c'\n", grade);
    return 0;
}

Run Program

Output

 

Explanation

Average: we take the marks of five subjects as input after that the sum of these marks is divided by 5 then It will return the average value of the marks.

Percentage: we made a division of the sum of the user's marks by 500 and then multiplied by 100 then It will return the percentage value of the marks.

Grade: we compared the value of the Average marks with this range of marks to find the Grade of students like:

 

If  Average marks >= 90 then Its Grade is 'A'

If Average marks >= 80 and < 90 then Its Grade is 'B'

If Average marks >= 70 and < 80 then Its Grade is 'C'

If Average marks >= 60 and < 70 then Its Grade is 'D'

If Average marks < 60 then Its Grade is 'E'

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C Program to Find Grade of a Student Using Switch Case

// C Program to Find Grade of a Student Using Switch Case
#include <stdio.h>

int main() {
    float subject_1, subject_2, subject_3, subject_4, subject_5;
    float total, average, percentage;
    char grade;
    int sAvg;

    printf("Enter the marks of five subjects::\n");
    scanf("%f%f%f%f%f", &subject_1, &subject_2, &subject_3, &subject_4, &subject_5);

    // It will calculate the Total, Average and Percentage
    total = subject_1 + subject_2 + subject_3 + subject_4 + subject_5;
    average = total / 5.0;
    percentage = (total / 500.0) * 100;

    // It will divides average by 10 check switch expression
    sAvg = (int) average / 10;

    // It will calculate the Grade
    switch (sAvg) {
        case 10:
            grade = 'A';
            break;

        case 9:
            grade = 'A';
            break;

        case 8:
            grade = 'B';
            break;

        case 7:
            grade = 'C';
            break;

        case 6:
            grade = 'D';
            break;

        default:
            grade = 'E';
            break;
    }

    // It will produce the final output
    printf("\nThe Total marks is:  \t%.2f / 500.00\n", total);
    printf("\nThe Average marks is:\t%.2f\n", average);
    printf("\nThe Percentage is:   \t%.2f%%\n", percentage);
    printf("\nThe Grade is:        \t'%c'\n", grade);
    return 0;
}

Run Program

Output

 

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C Program to Find Grade of a Student Using Function

// C Program to Find Grade of a Student Using Function
#include <stdio.h>

// @Custom function to Display Percentage & Grade
void CalcPercentGrade(float subject_1, float subject_2, float subject_3, float subject_4, float subject_5) {
    float total, average, percentage;
    char grade;

    // It will calculate the Total, Average and Percentage
    total = subject_1 + subject_2 + subject_3 + subject_4 + subject_5;
    average = total / 5.0;
    percentage = (total / 500.0) * 100;

    // It will calculate the Grade
    if (average >= 90)
        grade = 'A';
    else if (average >= 80 && average < 90)
        grade = 'B';
    else if (average >= 70 && average < 80)
        grade = 'C';
    else if (average >= 60 && average < 70)
        grade = 'D';
    else
        grade = 'E';

    // It will display final calculation
    printf("\nThe Total marks is:  \t%.2f / 500.00\n", total);
    printf("\nThe Average marks is:\t%.2f\n", average);
    printf("\nThe Percentage is:   \t%.2f%%\n", percentage);
    printf("\nThe Grade is:        \t'%c'\n", grade);
}

// @Driver function to Run this Program
int main() {
    float subject_1, subject_2, subject_3, subject_4, subject_5;

    printf("Enter the marks of five subjects::\n");
    scanf("%f%f%f%f%f", &subject_1, &subject_2, &subject_3, &subject_4, &subject_5);

    // It will produce the final output
    CalcPercentGrade(subject_1, subject_2, subject_3, subject_4, subject_5);
    return 0;
}

Run Program

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C Program to Find Grade of a Student Using Nested If else

// C Program to Find Grade of a Student Using Nested If else
#include <stdio.h>

int main() {
    float subject_1, subject_2, subject_3, subject_4, subject_5;
    float total, average, percentage;
    char grade;

    printf("Enter the marks of five subjects::\n");
    scanf("%f%f%f%f%f", &subject_1, &subject_2, &subject_3, &subject_4, &subject_5);

    // It will calculate the Total, Average and Percentage
    total = subject_1 + subject_2 + subject_3 + subject_4 + subject_5;
    average = total / 5.0;
    percentage = (total / 500.0) * 100;

    // It will calculate the Grade
    if (average >= 90) {
        grade = 'A';
    }
    else {
        if (average >= 80 && average < 90) {
            grade = 'B';
        }
        else {
            if (average >= 70 && average < 80) {
                grade = 'C';
            }
            else {
                if (average >= 60 && average < 70) {
                    grade = 'D';
                }
                else {
                    grade = 'E';
                }
            }
        }
    }

    // It will produce the final output
    printf("\nThe Total marks is:  \t%.2f / 500.00\n", total);
    printf("\nThe Average marks is:\t%.2f\n", average);
    printf("\nThe Percentage is:   \t%.2f%%\n", percentage);
    printf("\nThe Grade is:        \t'%c'\n", grade);
    return 0;
}

Run Program

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C Program to Find Grade of a Student Using Conditional Operator

// C Program to Find Grade of a Student Using Conditional Operator
#include <stdio.h>

int main() {
    float subject_1, subject_2, subject_3, subject_4, subject_5;
    float total, average, percentage;
    char grade;

    printf("Enter the marks of five subjects::\n");
    scanf("%f%f%f%f%f", &subject_1, &subject_2, &subject_3, &subject_4, &subject_5);

    // It will calculate the Total, Average and Percentage
    total = subject_1 + subject_2 + subject_3 + subject_4 + subject_5;
    average = total / 5.0;
    percentage = (total / 500.0) * 100;

    // It will calculate the Grade
    grade = average >= 90 ? 'A' : (average >= 80 && average < 90 ? 'B' : (average >= 70 && average < 80 ? 'C' : (average >= 60 && average < 70 ? 'D' : 'E')));

    // It will produce the final output
    printf("\nThe Total marks is:  \t%.2f / 500.00\n", total);
    printf("\nThe Average marks is:\t%.2f\n", average);
    printf("\nThe Percentage is:   \t%.2f%%\n", percentage);
    printf("\nThe Grade is:        \t'%c'\n", grade);
    return 0;
}

Run Program