Loop Program

Write a C++ Program to calculate the sum of a series up to x numbers.This program calculates the sum of the series 1 + 2 + 3 +. . . . .+ x and then display the result on screen.

Program Code:

#include<iostream>

using namespace std;

int main()

{

int x, i;

int sum=0;

cout<<"Program to calculate sum 1+2+3+... x :  ";

cout<<endl;

cout<<"Enter the value of x : ";

cin>>x;

cout<<endl;

sum = (x *(x+1)) / 2;

cout<<"Sum of the given series upto x number is : ";

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

{

if(i != x)

{

cout<<i<<" + ";

}

else

{

cout<<i<<" =  "<<sum;

}

}

return 0;

}

The program output is tested on www.jdoodle.com

Output:

Program to calculate sum 1+2+3+... x :  

Enter the value of x : 6

Sum of the given series upto x number is : 1 + 2 + 3 + 4 + 5 + 6 =  21

Thanks

Mukesh Rajput