Loops in Java (Exercise 14)

Java Programming: Programming Question on Loops in Java Programming
Topics Discussed:
1. Writing a program that reads a positive integer N and displays a rectangle of N rows.

Music:
Axol x Alex Skrindo - You [NCS Release]

#JavaByNeso #JavaProgramming #Loops

[riteshmadishetty]

i did this one. yay.
though i just solved a problem using loops i feel im a web developer lol,
but it really feels nice when we solve something we thought we couldnt solve.
thanks a lot neso academy and Ali Badran sir!!

[whereismyyoung]

Finally! first time solving problems on my own! after struggling with 13 loop excercises!

[aryanrasaily]

2nd part of the program using 2 loops:

import java.util.Scanner;
public class MyClass {
public static void main(String args[]) {
Scanner sc=new Scanner (System.in);
int x=sc.nextInt();
int i, j;
for(i=1;i<=x;i++){
for(j=1;j<=x;j++){

System.out.print("*");
}

else{
System.out.print(" ");
}

}
System.out.println();
}
}
}

[suswithcherry]

import java.util.Scanner;

class Check {
public static void main(String[] args) {

System.out.print("Enter a positive integer: ");
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();

for(int i = 1; i <= n; i++) {
for(int j = 1; j <= n; j++) {
System.out.print("*");
}

System.out.println();
}
}
}

//Time Complexity - O(2n) -> n = length of the string.

[suswithcherry]

* Updated Question - 1

import java.util.Scanner;

class Check {
public static void main(String[] args) {

System.out.print("Enter a positive integer: ");
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();

for(int i = 1; i <= n; i++) {
for(int j = 1; j <= n; j++) {
if(i == 1 || i == n)
System.out.print("*");
else {
if(j == 1 || j == n)
System.out.print("*");
else
System.out.print(" ");
}
}

System.out.println();
}
}
}

//Time Complexity - O(2n) -> n = length of the string.

[TroddenAnimations]

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



");
}
System.out.println();
}

this code is much easier

[onlyshorts]

or can use this for the empty rectangle



Scanner in = new Scanner(System.in);
int n= in.nextInt();
for(int i=1;i<=n;i++) {
for(int j=1;j<=n;j++) //loop for spaces
if(i==1||i==n || j==1|| j==n)
System.out.print("*");
else
System.out.print(" ");



System.out.println();

}
}

[Absalatreal]

import java.util.*;

public class Main {
public static void main(String[] args) {

Scanner input = new Scanner(System.in);

int num = input.nextInt();

for (int i =1 ; i <= num ; i++) {
for(int j =1 ; j<= num ; j++) {
System.out.print("*");
}
System.out.println();
}
}
}

[zubaerahammed]

import java.util.Scanner;
public class Main
{
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
System.out.print("Please enter number of rows: ");
int n = s.nextInt();

for(int i=1;i<=n;i++){
for(int j=1;j<=n;j++){
if(j==1 || j==n || i==1 || i ==n){
System.out.print("*");
} else {
System.out.print(" ");
}
}
System.out.println();
}
}
}

And exercise solution:
import java.util.Scanner;
public class Main
{
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
System.out.print("Please enter number of rows: ");
int n = s.nextInt();

for(int i=1;i<=n;i++){
for(int j=1;j<=n;j++){
if( (j!=1 && j!=n) || i==1 || i ==n){
System.out.print("*");
} else {
System.out.print(" ");
}
}
System.out.println();
}
}
}

[madasmsm]

public class Main {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        System.out.print("Enter an Int: ");
        int n = s.nextInt();
        for(int i = 1; i <= n; i++) {
            System.out.print("*");
            for(int j = 1; j <= n -2; j++)
                System.out.print(i == n || i == 1 ? "*" : " ");
            System.out.print("*");
            System.out.println();
        }
    }
}

[suswithcherry]

* Updated Question - 2

import java.util.Scanner;

class Check {
public static void main(String[] args) {

System.out.print("Enter a positive integer: ");
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();

for(int i = 1; i <= n; i++) {
for(int j = 1; j <= n; j++) {
if(i == 1 || i == n)
System.out.print("*");
else {
if(j == 1 || j == n)
System.out.print(" ");
else
System.out.print("*");
}
}

System.out.println();
}
}
}

//Time Complexity - O(2n) -> n = length of the string.