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C++ Exercises: Display such a pattern for n number of rows using number

C++: For Loop Exercise-47 with Solution

Write a program in C++ to display such a pattern for n number of rows using number. Each row will contain odd numbers of number. The first and last number of each row will be 1 and middle column will be the row number.

Sample Solution:-

C++ Code :

#include <iostream>
using namespace std;

int main()
{
   int i,j,n;
    cout << "\n\n Display a pattern using odd number of numbers, the first and last number of each row is 1:\n";
    cout << "-----------------------------------------------------------------------------------------------\n";
    cout << " Input number of rows: ";
    cin >> n;
    for(i=0;i<=n;i++)
   {
     /* print blank spaces */
     for(j=1;j<=n-i;j++)
	cout<<" ";
     /* Display number in ascending order upto middle*/
     for(j=1;j<=i;j++)
       cout<<j;
 
     /* Display  number in reverse order after middle */
       for(j=i-1;j>=1;j--)
	  cout<<j;
     cout<<endl;
   }
} 

Sample Output:

 Display a pattern using odd number of numbers, the first and last number of each row is 1:                                                   
-----------------------------------------------------------------------------------------------                                               
 Input number of rows: 5                                               
                                                                       
    1                                                                  
   121                                                                 
  12321                                                                
 1234321                                                               
123454321 

Flowchart:

Flowchart: Display such a pattern for n number of rows using number

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