Example: 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;
}