Java code to triangle number pattern
In this tutorial, we will learn about Java code to 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
- write this program of your text editor
- save your file name like as class name with .java extension
- compile the program using Javac compiler
- finally, run the program (using .class file)
Program 1
Triangle number pattern program 1
import java.util.Scanner;
public class Reverse_Pyramid{
public static void main(String args[]){
int rows;
Scanner s=new Scanner(System.in);
System.out.println("Enter number of rows");
rows=s.nextInt(); //get input from user
for(int i=1; i<=rows; i++){ //parent for loop
//to iterates row
for(int j=1; j<=i; j++){
System.out.print("");
}
for(int k=i; k<=rows; k++){
System.out.print(k+" ");//print number and space
}
System.out.println();//move to next line
}
}
}
When the above code is executed, it produces the following results:
1 2 3 4 5 6 7 8 2 3 4 5 6 7 8 3 4 5 6 7 8 4 5 6 7 8 5 6 7 8 6 7 8 7 8 8
Program 2
Triangle number pattern program 2
import java.util.Scanner;
public class JavatrianglePattern2{
public static void main(String args[]){
Scanner sc=new Scanner(System.in);
System.out.print("Enter the number of rows: ");
int rows=sc.nextInt();
for(int i=1; i<=rows; i++){//parent for loop lterate rows
for(int j=1; j<=i; j++){
System.out.print(j+" ");//print number and space
}
for(int j=i-1; j>=1; j--){
System.out.print(j+" ");
}
System.out.println();
}
System.out.println();//move to next line
}
}
When the above code is executed, it produces the following results:
1 1 2 1 1 2 3 2 1 1 2 3 4 3 2 1 1 2 3 4 5 4 3 2 1 1 2 3 4 5 6 5 4 3 2 1 1 2 3 4 5 6 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 9 8 7 6 5 4 3 2 1
Program 3
Triangle number pattern program 3
import java.util.Scanner;
public class JavatrianglePattern3{
public static void main(String args[]){
Scanner sc=new Scanner(System.in);
System.out.print("Enter the number of rows: ");
int rows=sc.nextInt();//get input for rows from user
for(int i=1; i<=rows; i++){//parent for loop lterate rows
for(int j=i; j>=1; j--){
System.out.print(j+" ");//print number and space
}
System.out.println();//move to next line
}
}
}
When the above code is executed, it produces the following results:
1 2 1 3 2 1 4 3 2 1 5 4 3 2 1 6 5 4 3 2 1 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 9 8 7 6 5 4 3 2 1
Program 4
Triangle number pattern program 4
import java.util.Scanner;
public class JavatrianglePattern4{
public static void main(String args[]){
Scanner sc=new Scanner(System.in);
System.out.print("Enter the number of rows: ");
int rows=sc.nextInt();//get input for rows from user
for(int i=1; i<=rows; i++){//parent for loop lterate rows
int count=i;
for(int j=1; j<=i; j++){
System.out.print(count+" ");//print number and space
count=count+rows-j;
}
System.out.println();//move to next line
}
}
}
When the above code is executed, it produces the following results:
1 2 10 3 11 18 4 12 19 25 5 13 20 26 31 6 14 21 27 32 36 7 15 22 28 33 37 40 8 16 23 29 34 38 41 43 9 17 24 30 35 39 42 44 45
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