Floyd’s triangle Number pattern using nested for in Java

Floyd’s triangle Number pattern using nested for in Java

In this tutorial, we will learn about Floyd’s triangle Number pattern using nested for in Java language

Nested loops are(for, while,do-while) useful to create funny patterns as number patterns alphabet, Star  patterns

We will learn in this tutorial about Triangle number pattern printing using nested for in Java

1. write this program of your text editor
2. save your file name like as class name and .java extension
3. compile the program using Javac compiler
4. finally, run the program (using .class file)

Program 1

package floyestrangle;
public class Floyestrangle {
    public static void main(String[] args) {
        int rows=7;//variable declaration and inilization
    for(int i=1; i<=rows; i++){//nested for loop
    for(int j=1; j<=i; j++){
    System.out.print(j); 
  }
    System.out.println();
  }
}
}

 

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

1
12
123
1234
12345
123456
1234567

 

 

you can add some appropriate changes in this program

below we can try to some small changes

package floyestrangle;
import java.util.Scanner;            //import scanner package
public class Floyestrangle {
    public static void main(String[] args) {
       System.out.println("welcome to print Floyd's triangle in java"); //add a description
System.out.println("please enter a number of rows :");
Scanner sc=new Scanner(System.in);   //use input method
int rows=sc.nextInt();               //get input from user to print Floyd's triangle
    for(int i=1; i<=rows; i++){
    for(int j=1; j<=i; j++){
    System.out.print(j +" ");//concatenate space in java 
                                     //get small space among the numbers
  }
    System.out.println();
  }
    }
}

In line 2- import scanner package

In line 5 – add a description

In line 7  – Use input method

In line 8 -get input from the user to print Floyd’s triangle

In line 11 – concatenate spaces

 

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

welcome to print floyd's triangle in java
please enter a number of rows :
7
1 
1 2 
1 2 3 
1 2 3 4 
1 2 3 4 5 
1 2 3 4 5 6 
1 2 3 4 5 6 7

 

Program 2

import java.util.Scanner; //import scanner package 
public class Floyestrangles
{ 
public static void main(String[] args) { 
System.out.println("welcome to print Floyd's triangle in java"); //add a description 
System.out.println("please enter a number of rows :"); 
Scanner sc=new Scanner(System.in); //user input method 
int rows=sc.nextInt(); //get input from user to print Floyd's triangle 
for(int i=1; i<=rows; i++){ 
for(int j=1; j<=i; j++){ 
System.out.print(i +" ");//concatenate space in java 
//get small space among the numbers 
} System.out.println(); 
} 
} 
}

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

welcomr to print floyd's triangle in java
please enter a number of rows :
7
1
22
333
4444
55555
666666
7777777

 

Program 3

package floydstriang;
import java.util.Scanner;
public class Floydstriang {
    public static void main(String[] args) {
        System.out.println("welcome to print Floyd's triangle in java");
        System.out.println("please enter a number of rows :"); 
  Scanner sc=new Scanner(System.in); 
        int rows=sc.nextInt();
        for(int i=10; i>=1; i--){
            for(int j=1; j<=rows; j++){
            System.out.print(j);
        }
            System.out.println();
            rows=rows-1;
        }
        }
}

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

welcome to print floyd's triangle in java
please enter a number of rows :
8
12345678
1234567
123456
12345
1234
123
12
1

Program 4

import java.util.Scanner;
class floydstriangle_3{
public static void main(String args[]){
  int num=1,i,j,k;//Declare variable
  System.out.println("floyd's triangle number pattern: ");
Scanner f3=new Scanner(System.in);
  System.out.println("Enter the number of row of you want: ");
   i=f3.nextInt();   //get input from user to print Floyd's triangle 
System.out.println("Here your Floyd's triangle ");
    for(j=1; j<=i; j++){
      for(k=1; k<=j; k++){
        System.out.print(num+" ");
        num++;
      }
        System.out.println();
    }
   }        
   }

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

Floyd's triangle number pattern:
Enter the number of row of you want:
7
Here your floyd's triangle 
1
2 3
4 5 6
7 8 9 10
11 12 13 14 15
16 17 18 19 20 21
22 23 24 25 26 27 28

 

Program 5

import java.util.Scanner;
class floydstriangle_4{
public static void main(String args[]){
  int num=1,i,j,k; //variable declaration
  System.out.println("Floyd's triangle number pattern: ");
Scanner f3=new Scanner(System.in);
//cretae a new scanner object
  System.out.println("Enter the number of row of you want: ");
   int row =f3.nextInt();//get the input from user
   System.out.println("Here your Floyd's triangle ");
   num=row*(row+1)/2;
    for(j=1; j<=row; j++){
      for(k=1; k<=j; k++){
        System.out.print(num+" ");
        num--;
      }
        System.out.println();
    }
   }        
   }

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

Floyd's triangle number pattern:
Enter the number of row of you want:
7
Here your Floyd's triangle
28
27 26
25 24 23
22 21 20 19
18 17 16 15 14
13 12 11 10  9  8
7  6  5  4  3 2  1

Program 6

//package Floyd's_triangle;
import java.util.Scanner; //import scanner package 
public class Floyd's_trangle6
{ 
public static void main(String args[]) { 
System.out.println("welcome to print Floyd's triangle in Java"); //add a description 
System.out.println("please enter the number of rows :"); 
Scanner sc=new Scanner(System.in); //user input metod 
int rows=sc.nextInt(); //get input from user to print Floyd's triangle 
for(int i=1; i<=rows; i++){ 
int k=i;
for(int j=1; j<=rows; j++){ 
if(j<i)
System.out.print(" ");
else
    System.out.print(k++);
}  
System.out.println("");
} 
} 
}

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

welcome to print Floyd's triangle in Java
please enter the number of rows :
6
 1 2 3 4 5 6
   2 3 4 5 6
     3 4 5 6
       4 5 6 
         5 6 
           6

 

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