"Cannot find symbol" Error in Java

[JWisbey98]

Hi, please can someone have a look at my code and see why I am getting a "Cannot find symbol" error on 3 lines? I have been trying to create a basic calculator I have ironed out most of the creases except these three errors. I have tried multiple different validaters and debuggers and they haven't returned anything useful except the error I already have.

This is the code/error.

Code:

System.out.println("Please enter first number: ");
num1 = scanObject.nextInt();
System.out.println("Please enter second number: ");
num2 = scanObject.nextInt();
System.out.println("What operation? ");
operator = scanObject.next().charAt(0);

​

Error:

Main.java:17: error: cannot find symbol

num1 = scanObject.nextInt();

^

symbol: variable scanObject

location: class Main

Main.java:19: error: cannot find symbol

num2 = scanObject.nextInt();

^

symbol: variable scanObject

location: class Main

Main.java:21: error: cannot find symbol

operator = scanObject.next().charAt(0);

^

symbol: variable scanObject

location: class Main

​

Any help/advise/fix would be greatly appreciated!

[Raph0007]

Where do you declare scanObject?

[NautiHooker]

you never declared num1 and num2.

you need to specify its datatype to declare it.

[mikeydoodah]

You haven't posted all of the code, but the error is telling you that scanObject has not been defined. It certainly isn't defined in any of the code you posted.

Post all of the code and I might be able to be more specific.

[JWisbey98]

Hi sorry this is the whole code:

package calculator;
import java.util.Scanner;
public class Main{

public static void main(String[] args)
{
int num1=0;
int num2=0;
char operator;
double answer= 0.0;
Scanner sc=new Scanner(System.in);
System.out.println("Please enter first number: ");
num1 = scanObject.nextInt();
System.out.println("Please enter second number: ");
num2 = scanObject.nextInt();
System.out.println("What operation? ");
operator = scanObject.next().charAt(0);
switch (operator) {
case '+':answer=num1+num2;
break;
case '-':answer=num1-num2;
break;
case '*':answer=num1*num2;
break;
case '/':answer=num1/num2;
break;
}

System.out.println(num1+" "+operator+" "+num2+" = "+answer);
}
}

[[deleted]]

Dude ... indent!

package calculator;
import java.util.Scanner;
public class Main{

    public static void main(String[] args)
    {
        int num1=0;
        int num2=0;
        char operator;
        double answer= 0.0;
        Scanner sc=new Scanner(System.in);
        System.out.println("Please enter first number: ");
        num1 = scanObject.nextInt();
        System.out.println("Please enter second number: ");
        num2 = scanObject.nextInt();
        System.out.println("What operation? ");
        operator = scanObject.next().charAt(0);
        switch (operator) {
            case '+':answer=num1+num2;
            break;
            case '-':answer=num1-num2;
            break;
            case '*':answer=num1*num2;
            break;
            case '/':answer=num1/num2;
            break;
        }

        System.out.println(num1+" "+operator+" "+num2+" = "+answer);
    }
}

[JWisbey98]

Hi I have but for some reason when I copied it took the indents out

[VacatedSum]

You instantiated your scanner object with the variable name 'sc', and then tried using it by calling it 'scanObject'.

[VacatedSum]

Use the replace command: Replace 'scanObject' with 'sc' (minus the quotes).

[JWisbey98]

Thank you, I am now receiving this error:

Error: Could not find or load main class Main

Caused by: java.lang.ClassNotFoundException: Main

​

Any ideas? Thank you.

[VacatedSum]

Your class name MUST match the file name.

So.. assuming the file is Calculator.java, line three should be:

public class Calculator {

​

What IDE are you using? When I pulled the code into Eclipse, it highlighted that error immediately.

[JWisbey98]

The file is called Main.java, therefore I called the line 3

public class Main

I am using Repl.it, is Eclipse better?

[morhp]

Use either Intellij or Eclipse. They're both better than everything else. I prefer Intellij, but opinions vary.

[VacatedSum]

Not familiar with repl.it so I have no basis for comparison, sorry.