Diagonal pattern using Numbers in C++

In this article, we will learn how to print a diagonal pattern using numbers in C++. We will print the same number in the upper diagonal and mix numbers in the lower diagonal of the square box.

Desired Output for Size 5:
1 1 1 1 1
1 1 1 2 2
1 1 3 3 3
1 4 4 4 4
5 5 5 5 5

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In this code sample, we are asking the user to enter the number of rows. When the user enters the number of rows then we are printing the pattern using the logic.

Let us understand this with the below code example.

#include <iostream>
using namespace std;
int main()
{
  int num;

  cout<<"Please enter the size of Square Box: ";
  cin>> num;

  for(int row=1; row<=num; row++)
  {
    
    for(int col=1; col<=num; col++)
    {
      if(col <= num-row)
	 cout<<"1";
      else 
	 cout<<row;
    } 

    cout<<"\n";
  } 

  return 0;
}

return 0;
}