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Module DEMO-32-58DEMO-C-32

Sum of Natural Numbers

DEMO-C-32 • Programming in C

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Problem Statement

Write a C program that calculates the sum of all natural numbers from 1 to n, where n is a positive integer provided by the user.

For example, if n = 5, the sum would be 1 + 2 + 3 + 4 + 5 = 15.

Use a loop to solve this problem.

Constraints

1 ≤ n ≤ 1000

Input Format

The input consists of a single positive integer n (1 ≤ n ≤ 1000).

Output Format

Output a single integer representing the sum of all natural numbers from 1 to n.

Sample Testcases

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Sample #1
Public sample
Input
5
Output
15
Explanation
1 + 2 + 3 + 4 + 5 = 15
Sample #2
Public sample
Input
1
Output
1
Explanation
Only one number to sum: 1
Sample #3
Public sample
Input
100
Output
5050
Explanation
Sum of first 100 natural numbers
Sample #4
Public sample
Input
7
Output
28
Explanation
1 + 2 + 3 + 4 + 5 + 6 + 7 = 28

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