CODEWITHSUNDEEP
java
Marlee3jackson
Marlee3jackson

Reputation: 47

I'm trying to get my program to print, but nothing happens when I run it

This code takes two numbers a base, and an integer, and it multiplies it out, but when I try and run it, it takes the numbers, then nothing happens.

import java.util.Scanner;
public class RaisedToThePower 
{ 
public static void main(String [] args)

 {

 Scanner reader = new Scanner(System.in);

 int base;
 int exponent;
 double x;

 System.out.println("Enter the base");
 base = reader.nextInt();

 System.out.println("Enter the exponent");
 exponent = reader.nextInt();

 x = base^exponent;

 while (exponent > (-1));
{
   System.out.println(x);
  }

 while (exponent <= -1);
  {
    System.out.println("Thanks for playing");
  }
 }
}

Upvotes: 0

Views: 1046

Answers (3)

Amrit Bhattacharjee
Amrit Bhattacharjee

Reputation: 1

That is not how you get power of a base:

x = base ^ exponential;

A simple Math.pow example, display 2 to the power of 8.

Math.pow(2, 8)

For details

First answer already explains everything.

Upvotes: -2

Ilgorbek Kuchkarov
Ilgorbek Kuchkarov

Reputation: 95

You have ; at end of each while loop while (exponent > (-1)); And you are not doing anything inside the both loop except printing. Any of the loop get hit it will be infinite loop.

Upvotes: 0

Pinkie Swirl
Pinkie Swirl

Reputation: 2415

Why nothing prints:

You are not printing anything, since you do 

while (exponent > (-1)) ;

The ; ends the while statement and since it is an infinite loop you never print anything.

{
    System.out.println(x);
}

This is just a statement in a block, which does not belong to the while

To fix this:

while (exponent > (-1)) // no ; here
{
    System.out.println(x);
}

This will still be an endless loop, if the exponent is bigger than -1.

The next while has the same problem.

Additional problem:

 x = base^exponent;

This does not execute an exponentiation.

^ is the XOR operator in java. (See Java Operators)

To get the power of an exponent you need to use:

Math.pow(base, exponent);

From the java docs:

Returns the value of the first argument raised to the power of the second argument.

Upvotes: 5

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