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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Category: C Programming Number Programs Tags: My name is Tunde Ajetomobi, a Tech Enthusiast and Growth Hacker. I enjoy creating helpful content that solves problem across different topics. Codezclub is my way of helping young aspiring programmers and students to hone their skills and find solutions on fundamental programming languages.

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Notify of Inline Feedbacks Can you explain the program pls explain the program /! You can use one loop to do it

using namespace std;
#include
int main()
{

int i,n,s,ts;
s=ts=0;
cin>>n;
for(i=1;i<=n;i++)
{
s=s+i;
ts=ts+s;
}
cout<<ts;
}