C++ Program to Find Average of 3 Numbers Using Function

Write a C++ Program to Find Average of 3 Numbers Using Function. In this program, we will take 3 numbers as input from the end-user, and pass them to a function to calculate the average of them. After calculating the average value that function will return a floating-point value, which will be stored to a variable and displayed on the screen. 

The entered number can be integer type or floating-point type therefore it is better to use float or double data type to store the input values. 

Find Average of 3 Numbers Using Function in C++

C++ Program to Find Average of 3 Numbers Using Function

#include<iostream>
using namespace std;

/* function to calculate average of
 * three numbers.
 */
double average(double n1, double n2, double n3) 
{
  return (n1 + n2 + n3)/3;
}

// main function
int main()
{
  double a, b, c; // to store numbers
  double avg; // to store result value

  // take three numbers as input values
  cout << "Enter three numbers: ";
  cin >> a >> b >> c;

  // function to find avg of 3 numbers
  avg = average(a, b, c);
  
  // display result
  cout << "Average = " << avg << endl;

  return 0;
}

Output for the different input values:-

Enter three numbers: 10 20 30
Average = 20

Enter three numbers: 15 26 30
Average = 23.6667

Enter three numbers: 15.5 20.6 19.32
Average = 18.4733

The average() function takes three numbers as floating-point values, and calculates its average value as (n1 + n2 + n3)/3. Then it returns the average value back to the caller function.

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