Cpp program to hollow triangle star pattern

In this tutorial, we will discuss the Cpp program to hollow triangle star pattern

We will learn how to create Floyd’s triangle hollow pattern in C++ language using nested for loop

Floyd’s triangle star pattern 1

Program 1

C++ program to display hollow right triangle star pattern

#include <iostream>
#include <conio.h>

using namespace std;

int main()
{
    int i,j,rows;
    cout << "Enter number of rows" << endl;
    cin>>rows; //get input from user
    for(i=1; i<=rows; i++){
        for(j=1; j<=i; j++){
        if(j==1 || j==i || i==rows){
            cout<<"*";
        }
        else{
            cout<<" ";
        }
    }
    cout<<"\n";
    }
    return 0;
}

When the above code is executed, it produces the following results:

Cpp program to hollow triangle star pattern — floyd’s triangle in C++

Floyd’s triangle star pattern 2

Program 2

C++ program to display hollow mirrored right triangle star pattern

#include <iostream>
#include <conio.h>
using namespace std;
int main()
{
    int i,j,rows;
    cout << "Enter the number of rows " << endl;
    cin>>rows;//get input from user
    for(i=1; i<=rows; i++){ //iterates for print row
        for(j=i; j<=rows; j++){
        cout<<" ";//print space
    }
        for(j=1; j<=i; j++){
                if(i==rows || j==1 || j==i)
                {
                    cout<<"*";
                }
                else{
                    cout<<" ";
                }

    }
    cout<<"\n";
    }
    getch();
    return 0;
}

When the above code is executed, it produces the following results:

Floyd’s triangle star pattern 3

Program 3

C++ program to display hollow inverted right triangle star pattern

#include <iostream>
#include <conio.h>
using namespace std;

int main()
{
    int i,j,rows;
    cout << "Enter the number of rows" << endl;
    cin>>rows; //get input from user
    for(i=1; i<=rows; i++){//parent for loop
        //this for loop used to iterate rows
        for(j=i; j<=rows; j++)
        {
            if(i==1 || j==i|| j==rows ){
                cout<<"*"; //print star
            }
            else{
                cout<<" ";
            }
        }
        cout<<"\n";//move to next line

    }
    getch();
    return 0;
}

When the above code is executed, it produces the following results:

Floyd’s triangle star pattern 4

Program 4

C++ program to display hollow inverted mirrored right triangle star pattern

#include <iostream>
#include <conio.h>
using namespace std;

int main()
{
    int i,j,rows;
    cout << "Enter the number of rows" << endl;
    cin>>rows; //get input from user
    for(i=1; i<=rows; i++){//parent for loop
        //this for loop used to iterate rows
        for(j=1; j<=i; j++)
        {
            cout<<" "; //print space
        }
            for(j=i; j<=rows; j++)
            {
                 if(i==1 || j==i|| j==rows ){
                cout<<"*"; //print star
            }
            else{
                cout<<" ";
            }
            }
        cout<<"\n";//move to next line
    }
    getch();
    return 0;
}

When the above code is executed, it produces the following results: