C++ Average of Three Numbers

In this tutorial, you will learn how to write C++ program to find the average of three numbers using Arithmetic operators.

C++ Program to Find Average of Three Numbers

We shall read three numbers from user and compute the average. Formula to compute the average of three numbers is given below.

Algorithm

We shall use following algorithm to compute average of three numbers in C++.

1. Start.
2. Read first number to num_1.
3. Read second number to num_2.
4. Read third number to num_3.
5. Initialize average with (num_1 + num_2 + num_3) /3.
6. Stop.

Program

In this example, we shall implement the above algorithm in C++. We shall read the numbers using cin, and compute the average using C++ Addition and C++ Division.

C++ Program

#include <iostream>
using namespace std;

int main() {
   int num_1;
   cout << "Enter num_1 : ";
   cin >> num_1;

   int num_2;
   cout << "Enter num_2 : ";
   cin >> num_2;

   int num_3;
   cout << "Enter num_3 : ";
   cin >> num_3;
   
   float average = (num_1 + num_2 + num_3) / 3;
   cout << "Average : " << average << endl;
}

We have taken float to store the average, because as we are dividing the sum of three numbers with 3, we may get a reminder left out if we take int to store the average.

Output

Enter num1 : 23
Enter num2 : 41
Enter num3 : 35
Average : 33

Conclusion

In this C++ Tutorial, we have written an algorithm and a C++ program to find average of three numbers.