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C++ Exercises: Print a square pattern with # character

C++ For Loop: Exercise-17 with Solution

Write a program in C++ to print a square pattern with # character.

Pictorial Presentation:

C++ Exercises: Print a square pattern with # character

Sample Solution :-

C++ Code :

#include <iostream>
using namespace std;

int main()
{
    int size;
    cout << "\n\n Print a pattern like square with # character:\n";
    cout << "--------------------------------------------------\n";
    cout << " Input the number of characters for a side: ";
    cin >> size;
    for (int row = 1; row <= size; ++row) 
    {
        for (int col = 1; col <= size; ++col) 
        {
            cout << "# ";
        }
        cout << endl;
    }
    return 0;
}

Sample Output:

 Print a pattern like square with # character:                         
--------------------------------------------------                     
 Input the number of characters for a side: 4                          
# # # #                                                                
# # # #                                                                
# # # #                                                                
# # # #

Flowchart:

Flowchart: Print a square pattern with # character

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