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C++ Exercises: Display the pattern using digits with left justified and the highest columns appears in first row in descending order

C++ For Loop: Exercise-52 with Solution

Write a program in C++ to display the pattern using digits with left justified and the highest columns appears in first row in descending order.

Pictorial Presentation:

C++ Exercises: Display the pattern using digits with left justified and the highest columns appears in first row in descending order

Sample Solution:-

C++ Code :

#include <iostream>
using namespace std;

int main()
{
    int i, j, rows, d;
    cout << "\n\n Display the pattern using digits with left justified:\n";
    cout << "----------------------------------------------------------\n";
    cout << " Input number of rows: ";
    cin >> rows;
    d = 0;
    for (i = 1; i <= rows; i++) 
	{
        for (j = rows - d; j >= 1; j--) 
		{
            cout << j << " ";
        }
        d++;
        cout << endl;
    }
}

Sample Output:

 Display the pattern using digits with left justified:                 
----------------------------------------------------------             
 Input number of rows: 5                                               
5 4 3 2 1                                                              
4 3 2 1                                                                
3 2 1                                                                  
2 1                                                                    
1

Flowchart:

Flowchart: Display the pattern using digits with left justified and the heighest columns appears in first row in descending order

C++ Code Editor:

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Next: Write a program in C++ to display the pattern like right angle triangle with right justified using digits.

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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