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C++ Exercises: Reverse a string

C++ For Loop: Exercise-85 with Solution

Write a program in C++ to reverse a string.

Pictorial Presentation:

C++ Exercises: Reverse a string

Sample Solution:-

C++ Code :

#include <iostream>
using namespace std;

void revOfString(const string& a);

int main()
{
    string str;
    cout << "\n\n Reverse a string:\n";
	cout << "----------------------\n";
	cout << " Enter a string: ";
    getline(cin, str);
    cout << " The string in reverse are: ";    
    revOfString(str);
    return 0;    
}

void revOfString(const string& str)
{
    size_t lengthOfString = str.size();

    if(lengthOfString == 1)
       cout << str << endl;
    else
    {
       cout << str[lengthOfString - 1];
       revOfString(str.substr(0, lengthOfString - 1));
    }
}

Sample Output:

 Reverse a string:                                                     
----------------------                                                 
 Enter a string: w3resource                                            
 The string in reverse are: ecruoser3w  

Flowchart:

Flowchart: Reverse a string

C++ Code Editor:

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C++ Programming: Tips of the Day

What is a smart pointer and when should I use one?

This answer is rather old, and so describes what was 'good' at the time, which was smart pointers provided by the Boost library. Since C++11, the standard library has provided sufficient smart pointers types, and so you should favour the use of std::unique_ptr, std::shared_ptr and std::weak_ptr.

There was also std::auto_ptr. It was very much like a scoped pointer, except that it also had the "special" dangerous ability to be copied - which also unexpectedly transfers ownership.

It was deprecated in C++11 and removed in C++17, so you shouldn't use it.

std::auto_ptr<MyObject> p1 (new MyObject());
std::auto_ptr<MyObject> p2 = p1; // Copy and transfer ownership. 
                                 // p1 gets set to empty!
p2->DoSomething(); // Works.
p1->DoSomething(); // Oh oh. Hopefully raises some NULL pointer exception.

Ref : https://bit.ly/3mc9GHE