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C++ Exercises: Display the pattern like a diamond

C++ For Loop: Exercise-44 with Solution

Write a program in C++ to display the pattern like a diamond.

Sample Solution:-

C++ Code :

#include <iostream>
using namespace std;

int main()
{
   int i,j,r;
    cout << "\n\n Display the pattern like a diamond:\n";
    cout << "----------------------------------------\n";
    cout << " Input number of rows (half of the diamond): ";
    cin >> r;
   for(i=0;i<=r;i++)
   {
     for(j=1;j<=r-i;j++)
     cout<<" ";
     for(j=1;j<=2*i-1;j++)
       cout<<"*";
     cout<<endl;
   }
   for(i=r-1;i>=1;i--)
   {
     for(j=1;j<=r-i;j++)
     cout<<" ";
     for(j=1;j<=2*i-1;j++)
       cout<<"*";
     cout<<endl;;
   }
}

Sample Output:

 Display the pattern like a diamond:                                   
----------------------------------------                               
 Input number of rows (half of the diamond): 5                         
                                                                       
    *                                                                  
   ***                                                                 
  *****                                                                
 *******                                                               
*********                                                              
 *******                                                               
  *****                                                                
   ***                                                                 
    *   

Flowchart:

Flowchart: Display the pattern like a diamond

C++ Code Editor:

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Next: Write a program in C++ to display Pascal's triangle like pyramid.

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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