Question

Wap in java to get an output




1
12
123
1234​

Answer 1

Easiest program:

package com.company;  

public class Main {

  public static void main(String[] args) {

      int s = 0;

      for (int i = 1; i <= 4 ; i++) {

          s = s*10+i;

          System.out.println(s);

      }

  }

}

Output:

1

12

123

1234

Answer 2

$\huge{\purple{\underline{\underline{\mathfrak{\red{\bigstar answer:: \bigstar}}}}}}$

public class Main {

  public static void main(String [] args) {

     for (int i = 1; i <= 4; i++) {

        for (int n = 1; n <= i; n++) {

           System.out.print(n);

        }

        System.out.print("\n");

     }

  }

}

$\gray{\rule{300pt}{0.3em}}$

$\huge{\purple{\underline{\underline{\mathfrak{\red{\bigstar Logic:: \bigstar}}}}}}$

• The class name is declared as "i"
• Then comes the main method where all the legal code goes in.
• We executed a loop for the variable "i" from 1 to 4.
• There is one more same loop but with variable "n" nested inside the 'i loop'.
• Then we print the variable "n" inside the loop.
• Outside this loop, we print the newline character to print the series accurately.
• And we finished it...

$\gray{\rule{300pt}{0.3em}}$

Hope it helps..♪