Step 3: Testing the algorithm by implementing it.

To test the algorithm, let’s implement it in the C language.

Program

C++

// C++ program to add three numbers

with the help of the above-designed

// algorithm

cpp#include <bits/stdc++.h>

using namespace std;

int main()

{

// Variables to take the input of

// the 3 numbers

int num1, num2, num3;

// Variable to store the resultant sum

int sum;

Take the 3 numbers as input.

cout << "Enter the 1st number: ";

cin >> num1;

cout << " " << num1 << endl;

cout << "Enter the 2nd number: ";

cin >> num2;

cout << " " << num2 << endl;

cout << "Enter the 3rd number: ";

cin >> num3;

cout << " " << num3;

// Calculate the sum using the + operator.

// and store it in the variable sum