Question

1. Write a program that produces the following output for a random number of digits on a row and a random number of rows.

1******

12*****

123****

1234***

12345**

123456*

1234567

1. Write a program that calculates the following series: i=1n(12)n=12+14+18+...+12n

(hint: we need to talk about integer division)

1. Use for loops to write a code segment that prints the following output.

1 2 3 4

2 4 6 8

3 6 9 12

4 8 12 16

5 10 15 20

Answer 1

1)

import java.util.*;

public class Main {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);

System.out.print("Enter n: ");

int n = sc.nextInt();

for(int i=1 ; i<=7 ; ++i){

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

if(j <= i)

System.out.print(j);

else

System.out.print("*");

}

System.out.println();

}

}

}

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SEE OUTPUT

OpenJDK Runtime Envir 0.18.04.4) javac -classpath .: java -classpath .:/ Enter n: 7 saved Main.java Files import java.util.* 1 Main.java class Main { 2 jdt.ls-java-project public static void main (String [] args) { Scanner sc = new Scanner(System.in); System.out.print("Enter n: "); int n sc.nextInt(); 4 1****** 5 12*** 123**** 1234*** 7 12345** 8 123456* for (int i-1 ; i<=7 ; ++i){ for(int j 1; j <= n; ++j ){ if (j System.out.print(j); 1234567 10 i) 11 <= 12 else 13 System.out.print("*"); 14 15 } 16 System.out.println(); 17 18 } 19 } 20 } 21

Thanks, PLEASE COMMENT if there is any concern.

2)

import java.util.*;

class Main {

public static void main(String[] args) {

for(int i=1 ; i<=5 ; ++i){

for(int j =1 ; j <= 4; ++j){

System.out.print((i*j) + " ");

}

System.out.println();

}

}

}

---------------------------------------------------------------------

saved Main.java OpenJDK Runtime Environment (build 10.0.2 0.18.04.4) javac -classpath .:/run_dir/junit-4.12. java -classpath .:/run_dir/junit-4.12. Files import java.util. * Main.java class Main { 2 1 2 3 4 jdt.ls-java-project public static void main (String [] args) { 2 4 6 8 5 369 12 for(int i-1 ; i<=5 ; ++i){ for(int j 1 ; j System.out.print ( ( i*j ) } 48 12 16 5 10 15 20 7 4; <= "); I 8 + System.out.println(); 10 11 } 12 } 13 } 14