CODEWITHSUNDEEP
java
Mhaus
Mhaus

Reputation: 11

Variable defined but still unable to be resolved

I'm learning java and was reading about methods in a text book. There is a program example to create a Celsius to Fahrenheit conversion table. I thought it would be a good idea to type into Eclipse and run the program. The program is below. Even thought it is exactly as the text in the book, I get the following error

c cannot be resolved to a variable

In the int f = (int) celsiusToFahrenheit, and in println(c + "C = " lines. It appears that c is defined in the for loop as int so not sure what is wrong. Any assistance would be appreciated.

/*
 * File: TermperatureConversionTable.java
 * ---------------------
 * This program creates a table of Celsius to Fahrenheit
 * equivalents using a function to perform the conversion.
 */

import acm.program.*;

public class TemperatureConversionTable extends ConsoleProgram {

    public void run() {
        println("Celsius to Fahrenheit table.");
        for (int c = LOWER_LIMIT; c <= UPPER_LIMIT; c += STEP_SIZE); {
            int f = (int) celsiusToFahrenheit(c);
            println(c + "C = " + f + "F");
        }
    }
/* Returns the Fahrenheit equivalent of the Celsius temperature c. */
    private double celsiusToFahrenheit(double c) {
        return 9.0 / 5.0 * c + 32;
    }

/* Private constants*/
    private static final int LOWER_LIMIT = 0;
    private static final int UPPER_LIMIT = 100;
    private static final int STEP_SIZE = 5;
}

Upvotes: 0

Views: 79

Answers (3)

TSKSwamy
TSKSwamy

Reputation: 225

A small mistake at for statement. 

for (int c = LOWER_LIMIT; c <= UPPER_LIMIT; c += STEP_SIZE); {
            int f = (int) celsiusToFahrenheit(c);
            println(c + "C = " + f + "F");
        }

Putting ; before { will terminate the loop without body and that's the cause of getting error as variable c is not defined in the body.

Refer: The for statement

Upvotes: 1

Matt Clark
Matt Clark

Reputation: 28579

Your issue is with the for loop, which is never actually looped due to an extra semicolon.

for (int c = LOWER_LIMIT; c <= UPPER_LIMIT; c += STEP_SIZE); {
                                             remove this   ^

Because of the semicolon, you terminate the statement, the following braces will just change the scope of that block of code, which wherein c is infact not defined.

Upvotes: 2

Tdorno
Tdorno

Reputation: 1571

Small syntactical error with a semicolon after the for-expression in your loop. Everything else looks fine to me.

    for (int c = LOWER_LIMIT; c <= UPPER_LIMIT; c += STEP_SIZE); //<---remove the semicolon 
    {
        int f = (int) celsiusToFahrenheit(c);
        println(c + "C = " + f + "F");
    }

Upvotes: 3

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