Why wont this compile?

i am doing an assignment for a course where you are supposed to create a program where it takes an inputted number of an inputted base, and converts it into a decimal(base 10). i have gotten this far and i am stuck. it will not compile and i am wondering if this is the best way to go about it?

Here is the code i have so far:

Code:

---

import java.util.Scanner;

public class AA3Q1{


        public static void main(String[] args) {

                int base;
                int binaryNumber;
                getNumberInBase();

                Scanner kbd = new Scanner(System.in);
                System.out.print("Enter a base.");
                base = kbd.nextInt();



                System.out.print(base, binaryNumber);

        }

        public static int getNumberInBase( Scanner scanner, int binaryNumber) {

        // get input from the user.
        Scanner kbd = new Scanner(System.in);
        System.out.print("Enter a binary number:");
        binaryNumber = kbd.nextInt();
        return binaryNumber;

        }
        public static int convertToDecimal(int number, int base, int binaryNumber, int copyOfBinNum, int currPower, int decimalNumber) {

                        // keep looping until -1 is encountered.
                        while (binaryNumber != -1) {

                                // reset values to 0, use copyOfBinNum for calculations.
                                decimalNumber = 0;
                                currPower = 0;
                                copyOfBinNum = binaryNumber;

                        }
                        // keep looping until all digits of copyOfBinNum are removed.
                        while (copyOfBinNum > 0) {

                                // get last digit and strip it off copyOfBinNum
                                currDigit = (int) copyOfBinNum % 10;
                                copyOfBinNum /= 10;

                                // add to the running total if the digit is one
                                if (currDigit < 10) {
                                        decimalNumber += Math.pow(base,currPower);
                                        return decimalNumber;
                                }

                                // increment the power of two for next loop.
                                currPower++;
                        }

                                return null;


        }
        public static void printResults(int number, int base, int result) {

        convertToDecimal();

        System.out.println("you input the number " + number + " in the base " + base + ". This number as a power of 10 is " + result + ".");

        }
}

---

Here is the Error message:

C:\Users\chelsea\Downloads\A3Q1.java:19: cannot find symbol
symbol : variable nextInt
location: class java.util.Scanner
base=keyboard.nextInt;
^
1 error

Tool completed with exit code 1

That code is not in the code you posted.
Therefore that error has not come from compiling this code.

Correct code or not, that error arises when you forget the parenthesis after nextInt. So variable = kbd.nextInt();
Also, the code that you inputted here does call the methods you have created but does not know where to assign the returned value. For example:

Code:

---

public static void main(String[] args) {

                int base;
                int binaryNumber;
                [COLOR="Red"]binaryNumber = [/COLOR]getNumberInBase();

                Scanner kbd = new Scanner(System.in);
                System.out.print("Enter a base.");
                base = kbd.nextInt();

             

                System.out.print(base, binaryNumber);

        }

---

then you're not calling the rest of your methods so that code never executes.

thank-you both of you. but ok so how do i show it where to assign the value? and do i have to call all of the methods in the code for it to execute?

Ok so i got am little bit further. now there is only 1 error message. Any ideas how i would fix it?

Here is the code:

Code:

---

import java.util.Scanner;

public class DanielsonErikA3Q1{

private static int currDigit;
private static int base;


        public static void main(String[] args) {

                int base;
                int binaryNumber;

                Scanner kbd = new Scanner(System.in);
                System.out.print("Enter a base.");
                base = kbd.nextInt();



                System.out.println(base, binaryNumber);

        }

        public static int getNumberInBase( Scanner scanner, int binaryNumber) {

        // get input from the user.
        Scanner kbd = new Scanner(System.in);
        System.out.print("Enter a binary number:");
        binaryNumber = kbd.nextInt();
        return binaryNumber;

        }
        public static int convertToDecimal(int number, int base, int binaryNumber, int copyOfBinNum, int currPower, int decimalNumber) {

                        // keep looping until -1 is encountered.
                        while (binaryNumber != -1) {

                                // reset values to 0, use copyOfBinNum for calculations.
                                decimalNumber = 0;
                                currPower = 0;
                                copyOfBinNum = binaryNumber;

                        }
                        // keep looping until all digits of copyOfBinNum are removed.
                        while (copyOfBinNum > 0) {

                                // get last digit and strip it off copyOfBinNum
                                currDigit = (int) copyOfBinNum % 10;
                                copyOfBinNum /= 10;

                                // add to the running total if the digit is one
                                if (currDigit < 10) {
                                        decimalNumber += Math.pow(base,currPower);
                                        return decimalNumber;
                                }

                                // increment the power of two for next loop.
                                currPower++;
                        }

                                return decimalNumber;


        }
        public static void printResults(int number, int base, int result) {



        System.out.println("you input the number " + number + " in the base " + base + ". This number as a power of 10 is " + result + ".");

        }
}

---

Here is the error message:

C:\Users\chelsea\Downloads\DanielsonErikA3Q1.java: 20: cannot find symbol
symbol : method println(int,int)
location: class java.io.PrintStream
System.out.println(base, binaryNumber);
^
1 error

Tool completed with exit code 1

The error message is telling you what's wrong. It can't find println(int, int) because this method simply doesn't exist. println takes a String parameter, not two ints.

Oops! sorry about that posted the wrong code. thanks though. here is what i am having a problem with.

Here is the code:

Code:

---

import java.util.Scanner;

public class DanielsonErikA3Q1{

private static int currDigit;
private static int base;
private static int binaryNumber;
private static int decimalNumber;


        public static void main(String[] args) {


                int base;
                int binaryNumber;

                Scanner kbd = new Scanner(System.in);
                System.out.print("Enter a base.");
                base = kbd.nextInt();

                System.out.println(base + "" + binaryNumber);

                printResults();


        }

        public static int getNumberInBase( Scanner scanner, int binaryNumber) {

        // get input from the user.
        Scanner kbd = new Scanner(System.in);
        System.out.print("Enter a binary number:");
        binaryNumber = kbd.nextInt();
        return binaryNumber;

        }
        public static int convertToDecimal(int number, int base, int binaryNumber, int copyOfBinNum, int currPower, int decimalNumber) {

                        // keep looping until -1 is encountered.
                        while (binaryNumber != -1) {

                                // reset values to 0, use copyOfBinNum for calculations.
                                decimalNumber = 0;
                                currPower = 0;
                                copyOfBinNum = binaryNumber;

                        }
                        // keep looping until all digits of copyOfBinNum are removed.
                        while (copyOfBinNum > 0) {

                                // get last digit and strip it off copyOfBinNum
                                currDigit = (int) copyOfBinNum % 10;
                                copyOfBinNum /= 10;

                                // add to the running total if the digit is one
                                if (currDigit < 10) {
                                        decimalNumber += Math.pow(base,currPower);
                                        return decimalNumber;
                                }

                                // increment the power of two for next loop.
                                currPower++;
                        }

                                return decimalNumber;


        }
        public static void printResults(int binaryNumber, int base, int decimalNumber) {



        System.out.println("you input the number " + binaryNumber + " in the base " + base + ". This number as a power of 10 is " + decimalNumber + ".");

        }
}

---

Here is the Error:

C:\Users\chelsea\Downloads\DanielsonErikA3Q1.java: 23: printResults(int,int,int) in DanielsonErikA3Q1 cannot be applied to ()
printResults();
^
1 error

Tool completed with exit code 1

At the end of your main() method, you call printResults, but pass no arguments to it. It requres three int values.

Quote:

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Originally Posted by Fubarable

println takes a String parameter

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Um, one of the 10 overloads does.

db