Write a C++ program to Calculate the sum of the series (1) + (1+2) + (1+2+3) + (1+2+3+4) + ... + (1+2+3+4+...+n), where n is entered by the user.

Write a C++ program to Calculate the sum of the series (1) + (1+2) + (1+2+3) + (1+2+3+4) + ... + (1+2+3+4+...+n), where n is entered by the user.

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Program Code:

#include<iostream>

using namespace std;

class series

{

int i,j,n;

 int calculate(void)

{

int result=0;

cout<<"Enter the value of n for the series: ";

cin>>n;

cout<<endl;

for(i=1;i<=n;i++)

{

for(j=1;j<=i;j++)

{

result=result+j;

}

}

return result;

}

public:

void putdata()

{

cout<<"Sum of the series upto n term is : = "<<calculate();

}

};

int main()

{

series obj;

obj.putdata();

return 0;

}

The program output is tested on www.jdoodle.com

Output:

Enter the value of n for the series: 15

Sum of the series upto n term is : = 680

Thanks

Mukesh Rajput