Sum Of N Numbers In C:

When a question is give like this , it simply mean that it is a user define program. Here, N will be declare by user. To sum a series of a number there are two ways , this are:

1. We can use loops(for/while) with a proper termination condition.
2. We can use mathematical formula i.e. n(n+1)/2 .

In this article we are going to discuss about this two type of procedure.

Method 1:

#include<stdio.h>
 int main()
 {
     int i,s=0,n,p;
     printf("ENTER THE LIMIT: ");
     scanf("%d",&n);
     for(i=1;i<=n;i++)
     {
         s=s+i;
     }
    
     printf("SUM OF %d NUMBERS IS: %d",i,s);
     return 0;
 }

Method 2:

#include<stdio.h>
int main()
{
int n,sum;
printf("ENTER LIMIT: ");
scanf("%d",&n);
sum=n*(n+1)/2;;
printf("SUM OF THE SERIES IS: %d",sum);
return 0;
}

Output:

And there you have done with your task!

Thank You.

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