Reverse a String in C++

By: Grant Braught Emailed: 1643 times Printed: 2110 times    

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This sample C++ program reverses a String and at the same time demonstrates the Pass by Reference parameters in C++ functions.
#include 

// Function prototypes...
void Reverse(string &theWord);

int main(void)
{
       	string MyWord;
       	
       	cout << "Enter a word to be reversed: ";
       	cin >> MyWord;
        
        cout << "Before Reverse:" << endl;
        cout << " MyWord = " << MyWord << endl << endl;
        
       	Reverse(MyWord);
        
        cout << "After Reverse:" << endl;
        cout << " MyWord = " << MyWord << endl << endl;
                
        return(0);
}

void Reverse(string &theWord)
{       // Reverse the string contained in theWord.

        int i;
        char temp;
        
        for (i=0; i<theWord.length()/2; i++)
        {
        	temp = theWord[i];
        	theWord[i] = theWord[theWord.length()-i-1];
        	theWord[theWord.length()-i-1] = temp;
        }
}  

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Comments(2)


1. View Comment

in this statement "void Reverse(string &theWord)"

if we pass only theWord only without & , the string is reversed , then why is needed here????


View Tutorial          By: vinay at 2012-12-13 16:41:59
2. View Comment

You are using stl; why do it by hand? All you need is a one liner that uses a built in algorithm...

reverse(MyWord.begin(), MyWord.end());

that works as we can treats a string as a array of characters.


View Tutorial          By: gavin at 2013-02-21 12:31:29

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