{"post":"

To get the sum of n numbers, there can be two cases:

Add consecutive n numbers.
Add any n numbers.

Method 1 – Sum of n consecutive numbers without an array(using while loop)

Algorithm:

Declare a variable n to store the number till which we need to find the sum.
Prompt the user to enter a value for n and store the input in n.
Declare a variable sum and initialize it to 0 to store the sum of the numbers from 1 to n.
Use a loop to iterate over the numbers from 1 to n, adding each number to sum.
After the loop terminates, print the value of sum.

Code:

#include <iostream>\nusing namespace std;\n\nint main()\n{\n    int n, sum = 0;\n    cout << \"Enter number till which you would like to add: \";\n    cin >> n;\n    while (n > 0)\n    {\n        sum += n;\n        n--;\n    }\n    cout << \"\\nSum is: \" << sum << endl;\n    return 0;\n}\n\n

Output:

Enter number till which you would like to add: 3\n\nSum is:6\n

Method 2 – Sum of n numbers without an array(using while loop)

Code:

#include <iostream>\nusing namespace std;\n\nint main()\n{\n    int n, sum = 0, number;\n    cout << \"How many numbers do you want to add? \";\n    cin >> n;\n    cout << \"\\nEnter numbers: \";\n    while (n > 0)\n    {\n        cin >> number;\n        sum += number;\n        n--;\n    }\n    cout << \"\\nSum is: \" << sum << endl;\n    return 0;\n}\n\n

Output:

How many numbers do you want to add? 7\n\nEnter numbers:\n1\n2\n3\n4\n5\n89\n34\n\nSum is:138\n

Method 3: Sum of n numbers in array(using for loop)

Code:

#include <iostream>\nusing namespace std;\n\nint main()\n{\n    int n, sum = 0;\n    cout << \"How many numbers do you want to add? \";\n    cin >> n;\n    int arr[n];\n    cout << \"\\nEnter numbers: \";\n    for (int i = 0; i < n; i++)\n        cin >> arr[i];\n    for (int i = 0; i < n; i++)\n        sum += arr[i];\n    cout << \"\\nSum is: \" << sum << endl;\n    return 0;\n}\n\n

Output:

How many numbers do you want to add? : 3\n\nEnter numbers:\n23\n12\n54\n\nSum is:89\n

\n","title":"Sum of n natural numbers in C++","authorDetails":{"name":"Juhi Kamdar","slug":"juhi-kamdar"},"seo":{"title":"Sum of n natural numbers in C++"},"description":"Learn how to calculate the sum of a set of natural numbers in C++ using three different methods. Method 1 demonstrates how to use a while loop to find the sum without using an array. Method 2 also uses a while loop, but does not require an array. Method 3 shows how to use a for loop and an array to calculate the sum. Follow along with the code and try each method to gain a better understanding of how they work.","slug":"cpp/examples/sum-of-n-numbers-program-in-cpp/","articleId":"636a83457bb1ce5072622bf7","bookmarkStatus":{"isBookmarked":false,"bookmarkId":null}}