Loop Program

Write a C++ program to calculate the sum of finite GP series and display the result on screen.

Program Code:

#include<iostream>

#include<math.h>

using namespace std;

int main()

{

float x,r,i,m;

int n;

float sum=0;

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

cin>>x;

cout<<endl;

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

cin>>n;

cout<<endl;

cout<<"Enter the common ratio of the GP series : ";

cin>>r;

cout<<endl;

sum = (x * ( 1 - pow( r, n+1 ) ) ) / (1 - r);

m = x * pow ( r, n-1 );

cout<<"Sum of all the numbers of the GP series is : ";

cout<<sum;

return 0;

} 

The program output is tested on www.jdoodle.com

Output:

Enter the first number of the GP series : 1

Enter the number of terms in the GP series : 10

Enter the common ratio of the GP series : 2

Sum of all the numbers of the GP series is : 2047

Thanks

Mukesh Rajput