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C++ Exercises: Display the number in reverse order

C++ For Loop: Exercise-30 with Solution

Write a program in C++ to display the number in reverse order.

Pictorial Presentation:

C++ Exercises: Display the number in reverse order

Sample Solution:-

C++ Code :

#include <iostream>
using namespace std;

int main()
{
    int num, r, sum = 0, t;
    cout << "\n\n Display the number in reverse order:\n";
    cout << "-----------------------------------------\n";
    cout << " Input a number: ";
    cin >> num;
    for (t = num; num != 0; num = num / 10) 
    {
        r = num % 10;
        sum = sum * 10 + r;
    }
    cout << " The number in reverse order is : " << sum << endl;
}

Sample Output:

 Display the number in reverse order:                                  
-----------------------------------------                              
 Input a number: 12345                                                 
 The number in reverse order is : 54321  

Flowchart:

Flowchart: Display the number in reverse order

C++ Code Editor:

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Previous: Write a program in C++ to find LCM of any two numbers using HCF.
Next: Write a program in C++ to find out the sum of an A.P. series.

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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