C++ Exercises: Display n terms of natural number and their sum

Last update on April 07 2025 12:59:49 (UTC/GMT +8 hours)

3. Display n Terms of Natural Numbers and Their Sum

Write a program in C++ to display n terms of natural numbers and their sum.

Visual Presentation:

C++ Exercises: Display n terms of natural number and their sum

Sample Solution :-

C++ Code :

#include <iostream> // Preprocessor directive to include the input/output stream header file

using namespace std; // Using the standard namespace to avoid writing std::

int main() // Start of the main function
{
    int n, i, sum = 0; // Declare integer variables 'n', 'i', and 'sum' and initialize 'sum' to 0

    cout << "\n\n Display n terms of natural number and their sum:\n"; // Display a message indicating the purpose
    cout << "---------------------------------------\n"; // Display a separator line
	cout << " Input a number of terms: "; // Prompt the user to input the number of terms
	cin >> n; // Read the user input for the number of terms		
    cout << " The natural numbers up to the " << n << "th term are: \n"; // Display a message indicating the list of natural numbers up to 'n'

    // Loop to print the natural numbers up to 'n' and calculate their sum
    for (i = 1; i <= n; i++) 
    {
        cout << i << " "; // Output each natural number followed by a space
		sum = sum + i; // Calculate the sum by adding the current number 'i' to 'sum'
    }

    cout << "\n The sum of the natural numbers is: " << sum << endl; // Display the sum of the natural numbers
}

Sample Output:

 Display n terms of natural number and their sum:                      
---------------------------------------                                
 Input a number of terms: 7                                            
 The natural numbers upto 7th terms are:                               
1 2 3 4 5 6 7                                                          
 The sum of the natural numbers is: 28

Flowchart:

For more Practice: Solve these Related Problems:

Write a C++ program to print the first n natural numbers and calculate their sum using a for loop with dynamic input.
Write a C++ program to display natural numbers up to n using recursion and then compute their total.
Write a C++ program that prompts for n and then prints the sequence of natural numbers along with a running total on each line.
Write a C++ program to generate an array of the first n natural numbers and then compute and display the sum of its elements.

C++ Code Editor:

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