Re: Java class problem
- From: Alex Hall <mehgcap@xxxxxxxxx>
- To: programmingblind@xxxxxxxxxxxxx
- Date: Sun, 27 Jun 2010 19:04:30 -0400
Seems to me that the problem is when you try to return the print
statement. Print is a function call and has no return; when you call
system.out.print, you expect only printed text, and nothing is
returned. Therefore, when you try to return the value of a print, you
are essentiall saying "return void", which will not do since your
class returns a string. Either make your class return void, or just
return the "close enough" or "will not do" strings and print them with
the function that called them.
On 6/27/10, Gilbert Neiva <gneiva@xxxxxxx> wrote:
> I'm trying to make a class that has a method to convert a celsius to two
> values, approximate fahrenheit, and accurate fahrenheit. The method is
> below.
>
> public static String celsFahr()
>
> // This method will print "Close enough"
>
> // If the values of approximate fahrenheit
>
> // are within two degrees of each other and
>
> // it will print "Will not do" if those two
>
> // values are not within
>
> // two degrees of each other
>
> {
>
> appFahr = cels * 2 + 32;
>
> // Formula to convert
>
> // celsius to approximate fahrenheit
>
> fahr = (9 / 5) * cels + 32;
>
> // Formula to convert celsius to accurate fahrenheit
>
> lessFahr = fahr - 3;
>
> greatFahr = fahr + 3;
>
>
> if ((appFahr <= fahr) && (appFahr > lessFahr) || (appFahr >= fahr) &&
> (appFahr < greatFahr))
>
> {
>
> return System.out.println("Close enough");
>
> }
>
> else
>
> {
>
> return System.out.println("Will not do");
>
> }
>
> } // End of method
>
>
>
> When I try to compile the .java file, I get the following error.
>
>
>
> FahrClss.java:90: incompatible types
> found : void
> required: java.lang.String
> return System.out.println("Close enough");
> ^
> FahrClss.java:94: incompatible types
> found : void
> required: java.lang.String
> return System.out.println("Will not do");
> ^
> 2 errors
>
>
>
> I tried importing java.lang.String at the top of my class.
>
>
>
> import java.lang.String;
>
>
>
> Unfortunately, that did not work. What am I doing wrong. My entire class is
> below.
>
>
>
> public class FahrClss
>
> {
>
> static int cels; // Stores the value for celsius
>
> static int appFahr; // Stores the value
>
> // of approximate fahrenheit
>
> static int fahr; // Stores the value of
>
> // exact fahrenheit
>
> static int lessFahr; // Stores the value of
>
> // fahr - 3
>
> static int greatFahr; // Stores the value of
>
> // fahr + 3
>
>
>
>
> public FahrClss(int newCels)
>
> // Start of parameterized constructor
>
> {
>
> cels = newCels; // Stores the value passed
>
> // from newCels
>
> }
>
>
>
>
> public FahrClss()
>
> // Start of default constructor
>
> {
>
> cels = 0; // object gets set to 0
>
> }
>
>
>
>
> public static int getCels()
>
> // Start of observer method
>
> {
>
> return cels; // Returns the value of
>
> // cels to driver class
>
> }
>
>
>
>
> public static int getAppFahr()
>
> // Start of observer method
>
> {
>
> return cels * 2 + 32; // Returns the value of
>
> // approximate fahrenheit to driver class
>
> }
>
>
>
>
> public static int getFahr()
>
> // Start of observer method
>
> {
>
> return (9 / 5) * cels + 32; // Returns the value of
>
> // fahrenheit to driver class
>
> }
>
>
>
>
> public static String celsFahr()
>
> // This method will print "Close enough"
>
> // If the values of approximate fahrenheit
>
> // are within two degrees of each other and
>
> // it will print "Will not do" if those two
>
> // values are not within
>
> // two degrees of each other
>
> {
>
> appFahr = cels * 2 + 32;
>
> // Formula to convert
>
> // celsius to approximate fahrenheit
>
> fahr = (9 / 5) * cels + 32;
>
> // Formula to convert celsius to accurate fahrenheit
>
> lessFahr = fahr - 3;
>
> greatFahr = fahr + 3;
>
>
>
>
> if ((appFahr <= fahr) && (appFahr > lessFahr) || (appFahr >= fahr) &&
> (appFahr < greatFahr))
>
> {
>
> return System.out.println("Close enough");
>
> }
>
> else
>
> {
>
> return System.out.println("Will not do");
>
> }
>
> } // End of method
>
> } // End of class
>
>
>
> Gilbert Neiva
>
>
>
--
Have a great day,
Alex (msg sent from GMail website)
mehgcap@xxxxxxxxx; http://www.facebook.com/mehgcap
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