Question

Create a program in C++ that has only an integer type input called in. This program interchanges two characters’ positions based on user’s input value. The specifications are:

If user enters 0, first and second characters are swapped.

If user enters 1, first and last characters are swapped.

If users enter 2, second and last characters are swapped.

For example:

The original text is “ABC”.

First letter is A, second letter is B and last letter is C.

If 0 is entered, out = BAC.            // first and second characters are swapped

if 1 is entered, out = CBA;             // first and last characters are swapped

if 2 is entered, out = ACB.            // second and last characters are swapped

Write a program that accomplishes above software specifications.

Answer 1

#include<iostream>

using namespace std;

int main()

{

    string str;

   

    while(1)

    {

        cout<<"Enter the string : ";

        cin>>str;

       

        // if length of strings is more than 2

        if(str.length() >= 3)

            break;

          

        cout<<"Error! Length of string should be more than 2\n";

    }

   

    cout<<"Press\n0, first and second characters are swapped.\n1, first and last characters are swapped.\n2, second and last characters are swapped.\n";

   

    int option;

    cin>>option;

   

    if(option == 0)

    {

        // swap elements

        char temp = str[0];

        str[0] = str[1];

        str[1] = temp;

    }

    else if(option == 1)

    {

        // swap elements

        char temp = str[0];

        str[0] = str[str.length() - 1];

        str[str.length() - 1] = temp;

    }

    else if(option == 2)

    {

        // swap elements

        char temp = str[1];

        str[1] = str[str.length() - 1];

        str[str.length() - 1] = temp;

    }

   

    cout<<"String : "<<str;

   

    return 0;

}

Sample Output:

nter the string ABC Press first and second characters are swapped 1. first and last characters are swapped 2. second and last characters are swapped String ACB Process exited after 3.798 seconds with return value 0 Press any key to continue . - .