Question

1. Write a program that prompts the user to enter three integers and display the integers in non-decreasing order. You can assume that all numbers are valid.

For example:

Input	Result
140 -5 10	Enter a number: Enter a number: Enter a number: -5, 10, 140

import java.util.Scanner;
public class Lab01 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
  
}
}

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2. Write a program that repeatedly prompts the user for integer values from standard input. The program then prints the square of each value until the user enters a sentinel value of -999, which causes the loop to exit. Do not print the sentinel value. You can assume that all integers are valid.

For example:

Input	Result
1 -999	Enter a number: The square of 1 is 1. Enter a number:
-998 999 -999	Enter a number: The square of -998 is 996004. Enter a number: The square of 999 is 998001. Enter a number:
-999 999 -999	Enter a number:

import java.util.Scanner;
public class Lab00 {
   public static void main(String[] args) {
       Scanner input = new Scanner(System.in);
   }
}

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3.

Write a program that repeatedly prompts the user for a line of alphabetical characters from standard input. The program then prints each line after making all characters in the sentence capitalized until the user enters an empty string, which causes the loop to exit. You can assume that the number of lines is always >1. You may find the input.hasNext() method is helpful.

For example:

Input	Result
Hello world Practice makes perfect	Enter a sentence: HELLO WORLD Enter a sentence: PRACTICE MAKES PERFECT Enter a sentence:

import java.util.Scanner;
public class Lab00 {
   public static void main(String[] args) {
       Scanner input = new Scanner(System.in);
   }
}

Answer 1

$\color{red}\underline{1:}$

import java.util.Scanner;

public class Lab01 {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        System.out.println("Enter a number: ");
        int n1 = input.nextInt();
        System.out.println("Enter a number: ");
        int n2 = input.nextInt();
        System.out.println("Enter a number: ");
        int n3 = input.nextInt();

        int min = n1, max = n1;
        if (n2 < min) min = n2;
        if (n3 < min) min = n3;
        if (n2 > max) max = n2;
        if (n3 > max) max = n3;
        int middle = (n1 + n2 + n3) - (min + max);

        System.out.println(min + ", " + middle + ", " + max);
    }
}

$\color{red}\underline{2:}$

import java.util.Scanner;

public class Lab00 {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int n;
        while (true) {
            System.out.println("Enter a number: ");
            n = input.nextInt();
            if (n == -999)
                break;
            System.out.println("The square of " + n + " is " + (n * n) + ".");
        }
    }
}

$\color{red}\underline{3:}$

import java.util.Scanner;

public class Lab00 {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        String s;
        while (true) {
            s = input.nextLine();
            if (s.isEmpty())
                break;
            System.out.println(s.toUpperCase());
        }
    }
}