C++ Exercises: Add all the numbers from 1 to a given number

Last update on August 11 2025 12:58:06 (UTC/GMT +8 hours)

Sum from 1 to n

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C++ Exercises: Add all the numbers from 1 to a given number

Write a C++ program to add all the numbers from 1 to a given number.

Sample Solution:

C++ Code :

#include <iostream> // Including input-output stream header file

using namespace std; // Using the standard namespace

// Function to calculate the sum of numbers from 1 to n
int Add_1_to_given_number(int n) {
    int total = 0; // Variable to store the total sum

    // Loop to add numbers from 1 to n
    for (int x = 1; x <= n; x++) {
        total += x; // Adding each number to the total sum
    }
    return total; // Returning the final total sum
}

int main() {
    // Printing the sum of numbers from 1 to 4 by calling the Add_1_to_given_number function with argument 4
    cout << "\nAdd 1 to 4: " << Add_1_to_given_number(4);

    // Printing the sum of numbers from 1 to 100 by calling the Add_1_to_given_number function with argument 100
    cout << "\nAdd 1 to 100: " << Add_1_to_given_number(100);

    return 0; // Indicating successful completion of the program
}

Sample Output:

Add 1 to 4: 10
Add 1 to 100: 5050

Flowchart:

For more Practice: Solve these Related Problems:

Write a C++ program that computes the sum of all numbers from 1 to n using a recursive function and compares it to the formula-based result.
Write a C++ program to calculate the sum from 1 to n using a loop and then display the result in a formatted equation.
Write a C++ program that computes the sum from 1 to n and then determines if the result is a prime number.
Write a C++ program to calculate the sum of numbers from 1 to n, then compute the average of these numbers, and display both results.

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