Printing diamond pattern outline using For Loop in C++


Example Program:

Here is the simple program for printing diamond pattern outline using For Loop in C++.

Source Code

#include<iostream>
using namespace std;
int main()
{
    int i,j,n;
    cout<<"\nEnter the value:";
    cin>>n;
    for(i=1;i<=n;i++)
    {
        cout<<"\n";
        for(j=1;j<=(n-i);j++)
        {
            cout<<"  ";
        }
        for(j=1;j<i;j++)
        {
            if(j==1)
            {
                cout<<" *";
            }
            else
            {
                cout<<"  ";
            }
        }
        for(j=1;j<=i;j++)
        {
            if(j==i)
            {
                cout<<" *";
            }
            else
            {
                cout<<"  ";
            }
        }
    }
    for(i=1;i<=n;i++)
    {
        cout<<"\n";
        for(j=1;j<=i;j++)
        {
            cout<<"  ";
        }
        for(j=n;j>i;j--)
        {
            if(j==n)
            {
            cout<<" *";
            }
            else
            {
                cout<<"  ";
            }
        }
        for(j=2;j<=(n-i);j++)
        {
            if(j==n-i)
            {
            cout<<" *";
            }
            else
            {
                cout<<"  ";
            }
        }
    }
    return 0;
}
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Output

Enter the value:10
                   *
                 *   *
               *       *
             *           *
           *               *
         *                   *
       *                       *
     *                           *
   *                               *
 *                                   *
   *                               *
     *                           *
       *                       *
         *                   *
           *               *
             *           *
               *       *
                 *   *
                   *
                    

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