Sum of first

Problem Statement

In this program we will code a basic program to find the sum of first ‘N’ numbers in C Programming language.

Code

#include

using namespace std;

int sumofn(int n)

{

 int sum=0,i;

 for(i=1;i<=n;i++)

 {

  sum+=i;

 }

 return sum;

}

int main()

{

  int n;

  printf("Enter the number ?\n");

  scanf("%d",&n);

  int res=sumofn(n);

  printf("Sum of first %d numbers : %d",n,res);

  return 0;

}

Output

Enter the number ? - 5

Sum of first 5 numbers : 15 

Explanation 

In this problem we have to find the sum of first 'N' numbers. To do so we declare a variable 'sum',which will store the result value(don't forget to initialize it with zero). Then,to access each value from '1' to 'N',we run the loop and update our 'sum' value by adding updated value of 'i', 'N' times,and we get the result.