C++ Program to Calculate Sum of 5 Subjects and Find Percentage and Grade

C++ program to calculate sum of 5 subjects and find percentage and grade.

In this article, you will learn how to make a C++ program to calculate sum of 5 subjects and find percentage and grade.

 

Example

 

You should have the knowledge of following these topics in c++ programming to understand this example:

• C++ main() function
• C++ cin object
• C++ cout object
• C++ If-else Statement
• C++ Switch Statement
• C++ Functions

 

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 solved this problem in four methods:

1. Using the if-else statement
2. Using the switch case statement
3. Using the functions
4. Using the nested if-else

C++ Program to Find Grade of a Student using If-else

// C++ Program to Calculate Sum of 5 Subjects and Find Percentage and Grade
#include <bits/stdc++.h>
using namespace std;

int main() {
    // To store the values of five subjects
    float sub_1, sub_2, sub_3, sub_4, sub_5;

    float total = 0.00, average = 0.00, percentage = 0.00;
    char grade;

    cout << "Enter the marks of five subjects::\n";
    cin >> sub_1 >> sub_2 >> sub_3 >> sub_4 >> sub_5;

    // It will calculate the Total, Average and Percentage
    total = sub_1 + sub_2 + sub_3 + sub_4 + sub_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
    cout << "\nThe Total marks   = " << total << "/500\n";
    cout << "The Average marks = " << average << "\n";
    cout << "The Percentage    = " << percentage << "%\n";
    cout << "The Grade         = '" << grade << "'\n";
    return 0;
}

Run Program

Output

C++ Program to Find Grade of a Student using Switch Statement

// C++ Program to Find Grade of a Student using Switch Statement
#include <bits/stdc++.h>
using namespace std;

int main() {
    // To store the values of five subjects
    float sub_1, sub_2, sub_3, sub_4, sub_5;

    float total = 0.00, average = 0.00, percentage = 0.00;
    char grade;
    int sAvg;

    cout << "Enter the marks of five subjects::\n";
    cin >> sub_1 >> sub_2 >> sub_3 >> sub_4 >> sub_5;

    // It will calculate the Total, Average and Percentage
    total = sub_1 + sub_2 + sub_3 + sub_4 + sub_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
    cout << "\nThe Total marks   = " << total << "/500\n";
    cout << "The Average marks = " << average << "\n";
    cout << "The Percentage    = " << percentage << "%\n";
    cout << "The Grade         = '" << grade << "'\n";
    return 0;
}

Run Program

 

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 user's marks by 500 then It 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'

---

C++ Program to Find Grade of a Student using Function

// C++ Program to Find Grade of a Student using Function
#include <bits/stdc++.h>
using namespace std;

// This function will display the percentage, average, and grade
void CalcPercentGrade(float sub_1, float sub_2, float sub_3, float sub_4, float sub_5) {
    float total = 0.00, average = 0.00, percentage = 0.00;
    char grade;

    // It will calculate the Total, Average and Percentage
    total = sub_1 + sub_2 + sub_3 + sub_4 + sub_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
    cout << "\nThe Total marks   = " << total << "/500\n";
    cout << "The Average marks = " << average << "\n";
    cout << "The Percentage    = " << percentage << "%\n";
    cout << "The Grade         = '" << grade << "'\n";
}

// It's the driver function
int main() {
    // To store the values of five subjects
    float sub_1, sub_2, sub_3, sub_4, sub_5;

    cout << "Enter the marks of five subjects::\n";
    cin >> sub_1 >> sub_2 >> sub_3 >> sub_4 >> sub_5;

    // It will produce the final output
    CalcPercentGrade(sub_1, sub_2, sub_3, sub_4, sub_5);
    return 0;
}

Run Program

 

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C Program to Calculate Percentage and Grade

Java Program to Calculate Grade of students

Python Program to Calculate Total Marks Percentage and Grade of a Student

---

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 <bits/stdc++.h>
using namespace std;

int main() {
    // To store the values of five subjects
    float sub_1, sub_2, sub_3, sub_4, sub_5;

    float total = 0.00, average = 0.00, percentage = 0.00;
    char grade;

    cout << "Enter the marks of five subjects::\n";
    cin >> sub_1 >> sub_2 >> sub_3 >> sub_4 >> sub_5;

    // It will calculate the Total, Average and Percentage
    total = sub_1 + sub_2 + sub_3 + sub_4 + sub_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
    cout << "\nThe Total marks   = " << total << "/500\n";
    cout << "The Average marks = " << average << "\n";
    cout << "The Percentage    = " << percentage << "%\n";
    cout << "The Grade         = '" << grade << "'\n";
    return 0;
}

Run Program

 

Also, visit these links

C++ Program to Find the Average of N Number

C++ Program to Perform all Arithmetic Operations