28. Program to calculate the sum of the first n odd integers.

Chapter 6: 

Looping Structures

Programming Exercise

Problem # 28:

Write a program to calculate the sum of the first n odd integers.

Solution:

#include<iostream>
#include<conio.h>
using namespace std;
int main()
{
    int n, o_num, num=0, sum=0;
    cout<<"Enter the number of odd numbers required:";
    cin>>o_num;
    for(n=1;num<o_num;n++)
    {
        if(n%2!=0)
        {
            sum=sum+n;
            num++;
        }  
    }
    cout<<"\nThe sum of first "<<num<<" odd numbers is: "<<sum<<endl;
    getch();
}

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29. Program that could find whether the number entered is odd or even and whether it is prime or not. Before termination find the total number of odds, evens and primes entered.