CODEWITHSUNDEEP
java
Sam Peterson
Sam Peterson

Reputation: 107

Why does it keep telling me it cannot find symbol?

The other Chapter 2 example files are working fine. I can't figure out why this particular class is having these problems - where I'm getting errors are labeled in comments.

package chapter2;

public class DataTypeConversion {
    public static void main(String[] args) {
        double x;
        int pies = 10; //error: not a statement
        x = y; //error: cannot find symbol: variable y

        int pies = 10, people = 4;
        double piesPerPerson;
        piesPerPerson = pies / people;
        piesPerPerson = (double) pies / people;

        final double INTEREST_RATE = 0.069; //Note that the variable name does not have
        amount = balance * 0.069; //error: cannot find symbol: variable: amount 
        amount = balance * INTEREST_RATE;
    }
}

My goal is to use this code as a stand alone Java file, so I don't know why it's complaining so much. Any ideas?

Upvotes: 0

Views: 139

Answers (4)

mel3kings
mel3kings

Reputation: 9405

Duplicate variable declaration:

 int pies = 10;

and

int pies = 10, people = 4;

Upvotes: 0

Grim0013
Grim0013

Reputation: 86

  • y is not declared or initialized before use. eg: int y = 0; (note, y is supposed to be an int, due to the exercise demonstrating narrowing/widening concepts)
  • pies is declared twice, lines 30 and 41. Remove line 30.
  • amount is not declared . eg: double amount = balance * 0.069;
  • balance is not declared or initialized before use, eg: double balance = 10.0; (must be done before attempting to use it with amount in line 59)

I think the key you need to remember at this stage is that before you can use a variable for the first time, it must be declared as a specific data type. eg: int, double, String, etc. A good practice, particularly as a student (which I am), is to declare all of your variables at the beginning of the code block (class/method/function, etc) in which they are declared.

Upvotes: 1

MadProgrammer
MadProgrammer

Reputation: 347314

I'm not sure what y is suppose to be equal, but you've not decalred it anywhere, so Java doesn't know anything about it...

You could try something like...

double x, y, amount, balance; // Might as weel add amount and balance cause they'll cause you errors now...
int pies = 10;//error: not a statement
x = y; // But this is garbage as y's value is undefined

Upvotes: 0

Jason
Jason

Reputation: 13986

You must declare your variables before using them. Add this line at the top:

double y, amount, balance;

Upvotes: 3

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