Loop Program

Write a C++ Program to find the sum of an AP series up-to a given number and display the result on the screen.

Program Code:

#include<iostream>

#include<math.h>

using namespace std;

int main()

{

int x, n, m;

int d, i;

int sum=0;

cout<<"Enter the first number of the AP series : ";

cin>>x;

cout<<endl;

cout<<"Enter total number of terms in the AP series : ";

cin>>n;

cout<<endl;

cout<<"Enter the common difference between each number of the AP series : ";

cin>>d;

cout<<endl;

sum=(n * ( 2 * x + (n - 1 ) * d ) ) / 2;

m = x + ( n - 1 ) * d;

cout<<"Sum of the given AP series is : ";

for(i = x; i <= m; i = i+d)

{

if(i != m)

{

cout<<i<<" + ";

}

else

{

cout<<i<<" = "<<sum;

}

}

return 0;

} 

The program output is tested on www.jdoodle.com

Output:

Enter the first number of the AP series : 1

Enter total number of terms in the AP series : 20

Enter the common difference between each number of the AP series : 2

Sum of the given AP series is : 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 = 100

Thanks

Mukesh Rajput