C++ Backward String Program

Backward String 

Write a function that accepts a C-string as an argument and displays its contents backwards. For instance, if the string argument is “Gravity” the function should display “ytivarG”. Demonstrate the function in a program that asks the user to input a string and then passes it to the function. 

Here is the output: (Click to enlarge)

Here is the code:

// Kim Pestana C++, Chapt. 11, Backward String

// Backward String

// Write a function that accepts a C-string as an argument and

// displays its contents backwards. For instance, if the string argument is “Gravity”

// the function should display “ytivarG”. Demonstrate the function in a program

// that asks the user to input a string and then passes it to the function.

#include <iostream>

#include <iomanip>

#include <fstream>

#include <string>

#include <cstring>

// Not sure if I need all libraries but it can't hurt. :)

using namespace std;

// C-String handling function

void Backward (char *);

int main()

{

// define array for letters in a word entered       

char word[41];

// ask user for input

cout << "This program will display the letters of a word entered in backwards order"

       "follwed by a period." << endl;

cout << "Please enter a word not over 40 letters:" << endl;

// display word entered backwards

cin >> word;

cout << "The entered word displayed in reverse is: " << word << endl;

Backward(word);

cout << endl;

       system("Pause");

       return 0;

}

void Backward (char *sentencePtr)

{

       char *p = sentencePtr;

       while ( *p != '\0' )

             ++p;

       while ( p != sentencePtr )

             cout.put ( *--p );

      

}