32. Program to calculate sum of the following series using for and do while loop: 1/3 + 3/5 + 5/7 + ... + 97/99

Chapter 6: 

Looping Structures

Programming Exercise

Problem # 32:

Write a program to calculate sum of the following series using for and do while loop:
1/3 + 3/5 + 5/7 + ... + 97/99

Solution:

Using a for loop:

#include<iostream>
#include<conio.h>
using namespace std;
int main()
{
    float n1, n2, sum=0;
    for(n1=1,n2=3;n1<=97;n1+=2,n2+=2)
    {
        sum=sum+(n1/n2);
    }
    cout<<"The sum of the series is: "<<sum;
    getch();
}

Using a do while loop:

#include<iostream>
#include<conio.h>
using namespace std;
int main()
{
    float n1=1, n2=3, sum=0;
    do
    {
        sum=sum+(n1/n2);
        n1+=2;
        n2+=2;
    }
    while(n1<=97);
    cout<<"The sum of the series is: "<<sum;
    getch();
}

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31. Program to add first nine terms of following series using for and while loop: 1/3! + 5/4! + 9/5! + ... where ! indicates factorial.

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33. Program to generate all possible combinations of 1, 2, 3 and 4.