By | 05.11.2016

# Sum of series S=1+(1+2)+(1+2+3)+..….+(1+2+3+…+n)

Write a C program to find Sum of series S=1+(1+2)+(1+2+3)+..….+(1+2+3+…+n).This program calculates the sum of series upto n i.e user input and produce result.

In this C Program, Firstly we are going to take input integer ‘n’ from the user and then starts loops starting from 1  to n and calculate sum for each iteration.After that just print the result i.e sum  as output on the screen.

Here, the C program to find Sum of series S=1+(1+2)+(1+2+3)+..….+(1+2+3+…+n) is successfully compiled and run on the windows system and produces the output as shown below for different input i.e n. Let’s check out this C Program shown below : :

## SOURCE CODE : :

```/*  C program to find Sum of series S=1+(1+2)+(1+2+3)+..….+(1+2+3+…+n)  */

#include<stdio.h>

int main()
{
int n,sum,sum1=0,i,j;

printf("\nEnter value for n = ");
scanf("%d",&n);

for(i=1;i<=n;i++)
{
sum=0;
for(j=1;j<=i;j++)
{
sum=sum+j;
}
sum1=sum1+sum;
}

printf("\nThe Sum of Series up to Value [ %d ] = [ %d ]\n",n,sum1);

return 0;
}```

### OUTPUT : :

```/*  C program to find Sum of series S=1+(1+2)+(1+2+3)+..….+(1+2+3+…+n)  */

Enter value for n = 10

The Sum of Series up to Value [ 10 ] = [ 220 ]

Process returned 0```

Above is the source code for C program to find Sum of series S=1+(1+2)+(1+2+3)+..….+(1+2+3+…+n) which is successfully compiled and run on Windows System.The Output of the program is shown above .

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