C++ Code Review: calculates sum of series of type 1 -4 7 -10 ... -40

Description: This program calculates sum of series of type 1 -4 7 -10 ... -40.

Code:

//Compiling Tool: Code::Block IDE with MinGW

//Program calculates sum of series of type 1 -4 7 -10 ... -40.

 

#include<iostream>

#include<conio.h> //for getch()

 

using namespace std;

 

int main()

{

 

    int i,a=-1,b,n;

 

    cout<<"Series Type:1 -4 7 -10 ... -40"<<endl;

    cout<<"Enter the range value of n:";

    cin>>n;

 

    for(i=1;i<=n;i+=3)

    {

        a*=-1;

        b=i;

        b*=a;

        cout<<b<<" ";

    }

 

    getch();

}     

 

Output:

 

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