Question

Write a program to use Math methods to calculate and display the followings:

1. Prompts the user to enter an angle, in degrees, and then display the angle in radians and the Sine of the angle.
2. Prompts the user to enter a positive integer and calculates the square root of the number. Computational thinking: Your program must check if it is a positive number. If a negative number is entered, it must ask for another number until the positive number is entered.
3. Prompts the user to enter two integers m & n, and displays the result of m^n.
4. Prompts the user to enter a decimal number and displays the number rounded, the floor, and the ceiling of the number.
5. Prompts for lower bound number L and upper bound number U, and displays a random number between L and U using the following formula:  L + (int)(Math.random() * (U - L + 1))

Evaluate all your answers to avoid shock & regret.

Display meaningful output for each task.

You only need to check if the input is valid in requirement # 2. For all the others, you can assume valid input is entered.

In JAVA

Answer 1

MathDemo.java
import java.util.Scanner;

public class MathDemo {

   public static void main(String[] args) {
       double angle = 0.0;
       Scanner scan = new Scanner(System.in);
       System.out.println("Enter angle in degrees: ");
       angle = scan.nextDouble();
       System.out.println("Angle in radians: " + Math.toRadians(angle));
       System.out.println("Sine (" + angle + ") = " + Math.sin(Math.toRadians(angle)));
       int number = 0;

//Continue asking for positive number, until positive number is entered
       do {
           System.out.println("Enter a positive integer: ");
           number = scan.nextInt();
       }while(number<0);
       System.out.println("Square root of " + number + " is " + Math.sqrt(number));
       int m, n;
       System.out.println("Enter m: ");
       m = scan.nextInt();
       System.out.println("Enter n: ");
       n = scan.nextInt();
       System.out.println("m^n = " + Math.pow(m, n));
       double decimal = 0.0;
       System.out.println("Enter a decimal number: ");
       decimal = scan.nextDouble();
       System.out.println("Decimal number rounded: " + Math.round(decimal));
       System.out.println("Decimal number floor: " + Math.floor(decimal));
       System.out.println("Decimal number ceiling: " + Math.ceil(decimal));
       System.out.println("Enter upper bound of random number: ");
       int U = scan.nextInt();
       System.out.println("Enter lower bound of random number: ");
       int L = scan.nextInt();

//Find random number, as given in the question
       int rand = L + (int)(Math.random() * (U-L+1));
       System.out.println("Random number between " + L + " & " + U + " is " + rand);
   }

}