How to Get Sum of Series 1+2+3+4+5+…. +n in C Program

It is easy to get sum of series 1 + 2 + 3 + 4 + . . . + n in C program. In this tutorial, I’ll show you how to do it in easy way in C program. Here is a simple code for it:

#include <stdio.h>
#include <conio.h>
void main()
{
int n,i;
int s=0;
printf("Enter the value of n of the series: ");
scanf("%d",&n);
s = (n * (n + 1)) / 2;
printf("Sum of the series: ");
for (i =1; i <= n; i++)
{
if(i==n)
printf("%d = %d ",i,s);
else
printf("%d + ",i);
}
getch();
}

Output:

Enter the value of n of the series: 10
Sum of the series: 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 = 55


In above code, I have sum up the series with a equation first. Then, I have tried to show number, plus sign, result and in a word equation  by iterating from 1 to n using for loop.

In this tutorial, I have shown how to get sum of series 1+2+…. +n in C Program. Hope you have enjoyed the tutorial. If you want to get updated, like the facebook page http://www.facebook.com/freetechtrainer and stay connected.