C++ Program to Find Average of N Numbers using For loop | While loop | Array | Functions

C++ program to find average of N numbers using for loop, while loop, array, and functions.

In this article, you will learn how to make a C++ program to find average of N numbers using for loop, while loop, array, and functions.

 

Example

 

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

• C++ main() function
• C++ cin object
• C++ cout object
• C++ For loop
• C++ While loop
• C++ Array
• C++ Functions

 

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

1. Using the for loop
2. Using the while loop
3. Using the array
4. Using the functions
5. Using the friend function

Source Code

// C++ Program to Find Average of N Numbers using For loop
#include <iostream>
using namespace std;

int main() {
    int x, i;
    float avg = 0, y;
    
    // x - To store the number of elements
    // avg - To store the total average value
    // y - To store the total input numbers

    cout << "Enter the number of elements to calculate the average::\n";
    cin >> x;
    
    cout << "Enter " << x << " elements one by one\n\n";
    for(i = 0; i < x; i++) {
        cin >> y;
        avg += y;
    }

    avg /= x;
    cout << "\nThe average of the entered input numbers is = " << avg;
    return 0;
}

Run Program

Output

 

Explanation

In this given program, we have taken two types of input from the user first size of the number of elements 4 and second, these numbers following: 6462, 62, 5645, and 667 to calculate the average on these numbers via the system console.

Then we make sum of these numbers and it is divided by the size of element 4.

After the above calculation, it will return 3209 average of the given input numbers.

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C++ Program to Find Average of N Numbers using While loop

// C++ Program to Find Average of N Numbers using While loop
#include <iostream>
using namespace std;

int main() {
    int x, i = 0;
    float avg = 0, y;
    
    // x - To store the number of elements
    // avg - To store the total average value
    // y - To store the total input numbers

    cout << "Enter the number of elements to calculate the average::\n";
    cin >> x;
    
    cout << "Enter " << x << " elements one by one\n\n";
    while (i < x) {
        cin >> y;
        avg += y;
        i++;
    }
    
    avg /= x;
    cout << "\nThe average of the entered input numbers is = " << avg;
    return 0;
}

Run Program

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C++ Program to Find Average of N Numbers using Array

// C++ Program to Find Average of N Numbers using Array
#include <iostream>
using namespace std;

int main() {
    int x, i;
    float avg = 0.00;
    
    // x - To store the number of elements
    // avg - To store the total average value
    // y - To store the total input numbers

    cout << "Enter the number of elements to calculate the average::\n";
    cin >> x;

    float Num[x];
    
    cout << "\nEnter " << x << " elements one by one\n";
    for(i = 0; i < x; i++) {
        cin >> Num[i];
        avg += Num[i];
    }

    avg /= x;
    cout << "\nAverage of the entered input numbers is = " << avg;
    return 0;
}

Run Program

Output

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C++ Program to Find Average of N Numbers using Functions

// C++ Program to Find Average of N Numbers using Functions
#include <iostream>
using namespace std;

// This function will calculate average of N numbers
float FindAverage(int x) {
    int i;
    float avg = 0, y;

    // avg - To store the total average value
    // y - To store the total input numbers

    cout << "\nEnter " << x << " elements one by one\n\n";
    for(i = 0; i < x; i++) {
        cin >> y;
        avg += y;
    }

    avg /= x;
    cout << "\nThe average of the entered input numbers is = " << avg;
}

// It's the driver function
int main() {
    int x; // To store the number of elements

    cout << "Enter the number of elements to calculate the average::\n";
    cin >> x;
    
    FindAverage(x);
    return 0;
}

Run Program

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C++ Program to Find Average of N Numbers using Friend Function

// C++ Program to Find Average of N Numbers using Friend Function
#include <bits/stdc++.h>
using namespace std;

class Average {
public:
    int x; // To store the number of elements

    void Display() {
        cout << "Enter the number of elements to calculate the average::\n";
        cin >> x;
    }

    // It will print the final output
    friend void Calculate(Average AR);
};

void Calculate(Average AR) {
    float avg = 0, y;
    // avg - To store the total average value
    // y - To store the total input numbers

    cout << "\nEnter " << AR.x << " elements one by one\n";
    for(int i = 0; i < AR.x; i++) {
        cin >> y;
        avg += y;
    }

    avg /= AR.x;
    cout << "\nThe average of the entered input numbers is = " << avg << endl;
}

// It's the driver function
int main() {

    // To create the instance of `Average` class
    Average AR;
    AR.Display();

    // It will print the final output
    Calculate(AR);

    return 0;
}

Run Program

Output

 

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