Please use explanations for the code. Thank you. Using Scanner for User Input Wr

Question

Please use explanations for the code. Thank you.

Using Scanner for User Input

Write a program that asks the user for an integer, then prints the integer, its square, and its cube to the screen.

Try computing the output in two ways:

1) without using Math.pow()

2)  using Math.pow()

Use the Java API to learn what parameters Math.pow() requires.

Note: pow() is a static method of the Math class, which means that you do not need a Math object to call it. To call the pow() method, just write Math.pow(), but fill in the appropriate parameters between the ().

Challenge: Change your program to ask the user for two integers. Use Math.pow() to compute xn where x is the first integer the user enters, and n is the second integer the user enters.

Explanation / Answer

PowerRaisedToNum.java

import java.util.Scanner;

public class PowerRaisedToNum {

   public static void main(String[] args) {
       //Declaring the variable
       int num;
      
       //Scanner object is used to get the inputs entered by the user
       Scanner sc=new Scanner(System.in);
      
       //getting the number entered by the user
System.out.print("Enter the number :");
num=sc.nextInt();

//calculating the square and cube of number without using Math.pow()
System.out.println("** Without using Math.pow() **");
System.out.println("Square of a number :"+num*num);
System.out.println("Cube of a number :"+num*num*num);

//calculating the square and cube of number with using Math.pow()
System.out.println(" ** Using Math.pow() **");   
System.out.println("Square of a number :"+(int)Math.pow(num,2));
System.out.println("Square of a number :"+(int)Math.pow(num,3));

   }

}

_______________

Output:

Enter the number :5
** Without using Math.pow() **
Square of a number :25
Cube of a number :125

** Using Math.pow() **
Square of a number :25
Square of a number :125

_______________

PowerRaisedToNum1.java

import java.util.Scanner;

public class PowerRaisedToNum1 {

   public static void main(String[] args) {
       //Declaring the variable
       int x,n;

       //Scanner object is used to get the inputs entered by the user
       Scanner sc=new Scanner(System.in);
      
       //getting the number entered by the user
System.out.print("Enter the number x :");
x=sc.nextInt();

//getting the number entered by the user
System.out.print("Enter the Power n :");
n=sc.nextInt();

System.out.println(x+" rised to "+n+" is : "+(int)Math.pow(x, n));

}

}

_____________

Output:

Enter the number x :5
Enter the Power n :7
5 rised to 7 is : 78125

______________

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