Question

Here is a part of my code I’m having trouble with:

===Class Overload===

public class Overload  
{    
    public void testOverLoadeds()  
      {  
        System.out.printf("Square of integer 7 is %d\n",square(7));  
        System.out.printf("Square of double 7.5 is %d\n",square(7.5));  
    }//..end testOverloadeds  

    public int square(int intValue)
    {


 System.out. printf("\nCalled square with int argument: %d\n",intValue);
   return intValue * intValue;
}//..end square int

public double square(double doubleValue)
        {
System.out.printf("\nCalled square with double argument: %d\n", doubleValue);
return doubleValue * doubleValue;

}//..end square double
}//..end class overload


 ===Main===
public static void main(String[] args) {

    Overload methodOverload = new Overload();
    methodOverload.testOverLoadeds(); }

It compiles with no error, however when I try to run it the output is:

Called square with int argument: 7
Square of integer 7 is 49

Exception in thread “main”
java.util.IllegalFormatConversionException:
d != java.lang.Double
at java.util.Formatter$FormatSpecifier.failConversion(Formatter.java:3999)
at java.util.Formatter$FormatSpecifier.printInteger(Formatter.java:2709)
at java.util.Formatter$FormatSpecifier.print(Formatter.java:2661)
at java.util.Formatter.format(Formatter.java:2433)
at java.io.PrintStream.format(PrintStream.java:920)
at java.io.PrintStream.printf(PrintStream.java:821)
at methodoverload.Overload.square(Overload.java:19)
at methodoverload.Overload.testOverLoadeds(Overload.java:8)
at methodoverload.Main.main(Main.java:9)
Called square with double argument:Java Result: 1

What am I doing wrong?

I’m on Ubuntu 10.10, Netbeans 6.9.

Thanks.

Answer 1

The format specifier for double values is f, not d. So this line should be:

 System.out.printf("\nCalled square with double argument: %f\n", doubleValue);

More details about the format specifiers here.