Write a program that defines a function to add first n numbers

As we know natural numbers contain all the positive numbers starting from 1, 2, 3, to n numbers or infinity. For example, suppose when we calculate the sum of the first 25 numbers. That means we start adding the numbers from 1 to the given number 25, and the process is called the sum of the first N natural number. In this topic, we will learn how to find the sum of first n numbers using a C program.

Mathematical Formula

Following is the representation to find the sum of n natural numbers using the mathematical formula:

Sum of n natural number = n*(n+1)/2

•  Program:

#include<stdio.h>

int main()
{
    int n, sum=0, c, value;

    printf("Enter the number of integers you want to add: ");
    scanf("%d",&n);
    printf("Enter %d intergers:\n",n);
    for(c=1; c<=n; c++)
    {
        scanf("%d",&value);
        sum=sum+value;
    }
    printf("Sum of entered integers: %d",sum);
    return 0;
}

Enter the number of integers you want to add: 5
Enter 5 intergers:
1
36
3
9
11
Sum of entered integers: 60

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