Hi everyone … I will share some java source code which will help beginner level programmer to solve basic programming problems..

All code has been solved by : Afjalur Rahman Rana

Note: firstly try to solve the problem by yourself.. then if you can’t see the solution & if you find difficulty to any code then comment below… I will try to give you proper guide 🙂

Problem  #6:

Triangle – Left Justified
Draw right angled triangle of given height
Sample input:

Sample input:
4
Sample output
1
12
123
1234

Solution:

import java.util.Scanner;
public class Task6{
  public static void main(String[] args){
    int n;
    Scanner sc = new Scanner(System.in);
    
    System.out.print("Input row");
    int row = sc.nextInt();
    
    for(int r = 0 ;r<=row;r++){
      for(int c=1;c<=r;c++){
        System.out.print(c);
      }
      System.out.print("\n");
    }
  }
}

Problem  #7:

Triangle – Right Justified
Draw right angled triangle of given height

Sample input:
4
Sample output
*
**
***
****

Solution:

import java.util.Scanner;
public class Task7{
  public static void main(String[] args){
    int n;
    Scanner sc = new Scanner(System.in);
    
    System.out.print("Input row");
    int row = sc.nextInt();
    
    for(int r = 1 ;r<=row;r++){
      //while row is increasing space is decreasing
      for(int space = 1;space<=row-r;space++){
        System.out.print(" ");
      }
      for(int c=1;c<=r;c++){
        System.out.print("*");
      }
      
      System.out.print("\n");
    }
    
  }
}

Problem  #8:

Triangle – Right Justified
Draw right angled triangle of given height

Sample input:
4
Sample output
1
12
123
1234

Solution:

import java.util.Scanner;
public class Task8{
  public static void main(String[] args){
    int n;
    Scanner sc = new Scanner(System.in);
    
    System.out.print("Input row");
    int row = sc.nextInt();
    
    for(int r = 1 ;r<=row;r++){
      //while row is increasing space is decreasing
      for(int space = 1;space<=row-r;space++){
        System.out.print(" ");
      }
      for(int c=1;c<=r;c++){
        System.out.print(c);
      }
      
      System.out.print("\n");
    }
    
  }
}

Problem  #9:

Rectangle Number

Sample input:
3
Sample output
Triangle – Isosceles
Draw triangle of given height

Solution:

import java.util.Scanner;
public class Task9{
  public static void main(String[] args){
    int n;
    Scanner sc = new Scanner(System.in);
    
    System.out.print("Input row");
    int row = sc.nextInt();
    int j =1;
    for(int r = 1 ;r<=row;r++){
      //while row is increasing space is decreasing
      for(int space = 1;space<=row-r;space++){
      System.out.print(" ");
      }
      for(int c=1;c<=j;c++){
      System.out.print("*");

    }
            j+=2;

    System.out.print("\n");
    }
  
  }
}

Problem  #10:

Triangle – Isosceles
Draw triangle of given height

Sample input:
4
Sample output
1
123
12345

Solution:

import java.util.Scanner;
public class Task10{
  public static void main(String[] args){
    int n;
    Scanner sc = new Scanner(System.in);
    
    System.out.print("Input row");
    int row = sc.nextInt();
    int j =1;
    for(int r = 1 ;r<=row;r++){
      //while row is increasing space is decreasing
      for(int space = 1;space<=row-r;space++){
        System.out.print(" ");
      }
      for(int c=1;c<=j;c++){
        System.out.print(c);
        
      }
      j+=2;
      System.out.print("\n");
    }
    
  }
}

To be continued……