C Program for Sum Of N Natural Numbers

Find the Sum of N Natural Numbers in C

Find the Sum of N Natural Numbers in C

Given an integer input num, the objective is to write a code to find the Sum of N Natural Numbers in C. To do so we iterate and add all the numbers until num.

Example:
Input : 5
Output : 1 + 2 + 3 + 4 + 5 = 15

Algorithm

The Algorithm for the above problem is as follows,

  • Step 1. Start
  • Step 2. Enter a number (N).
  • Step 3. Use “For loop” to iterate  upto the user inserted value. 
  • Step 4. The “For loop” will calculate the sum of the user inserted value. 
  • Step 5. Stop

Let’s try and understand it better using the Image given below.

C Program for Sum Of N Natural Numbers

#include <stdio.h>
int main() 
{ 
    //for initialize variable
    int Number, i, Sum = 0;
    //to take user input
    printf ("\n Kindly Insert an Integer Variable\n");
    scanf ("%d", &Number);

    //use for loop for these condition
    for(i = 1; i <= Number; i++)
    {
         Sum = Sum + i;
    }

    //display
    printf ("Sum of Natural Numbers = %d", Sum);

    return 0;
}

Output

Kindly Insert an Integer Variable : 3 
Sum of Natural Numbers = 6

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