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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#includeusing 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<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 : = "<}};int main(){series obj;obj.putdata();return 0;}
The program output is tested on www.jdoodle.comOutput:Enter the value of n for the series: 15Sum of the series upto n term is : = 680

ThanksMukesh Rajput