Printing triangle pattern outline using For Loop in C++


Example Program

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

Source Code Example : 1

#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;j++)
        {
            if(j==1||i==n||j==i)
            {
                cout<<" *";
            }
            else
                cout<<"  ";
        }
    }
    return 0;
}
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Output

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

Source Code Example : 2

#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<=i;j++)
        {
            cout<<"  ";
        }
        for(j=n;j>=i;j--)
        {
            if(i==1||j==n||j==i)
            {
                cout<<" *";
            }
            else
            {
                cout<<"  ";
            }
        }
    }
    return 0;
}
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Output

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

Source Code Example : 3

#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||i==n||j==i)
            {
                cout<<" *";
            }
            else
            {
                cout<<"  ";
            }
        }
    }
    return 0;
}

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Output

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

Source Code Example : 4

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

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Output

Enter the Limit:10
 * * * * * * * * * *
 *               *
 *             *
 *           *
 *         *
 *       *
 *     *
 *   *
 * *
 *


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