printing problem

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gk - 14 Sep 2006 18:29 GMT

int a = 5;

System.out.println("Value is - " + ((a < 5) ? 9.9 : 9));

output: 9.0

where from 9.0 came from ? there is 9 but NOT 9.0

see, the condition a<5 is false.....so this should print 9

but output is 9.0

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Gordon Beaton - 14 Sep 2006 18:50 GMT

> int a = 5;
>
[quoted text clipped - 7 lines]
>
> but output is 9.0

An expression using the conditional operator ?: can only have one type
that must be determined at compile time. Since one of the operands is
float, the other is promoted to float and it becomes a float
expression.

It's described here, and the rule that's applied is called binary
numeric promotion:

http://java.sun.com/docs/books/jls/second_edition/html/expressions.doc.html#290293

/gordon

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[ don't email me support questions or followups ]
g o r d o n + n e w s @ b a l d e r 1 3 . s e

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Patricia Shanahan - 15 Sep 2006 18:21 GMT

>> int a = 5;
>>
[quoted text clipped - 19 lines]
>
> /gordon

If this is specifically for printing, could you use strings rather than
numbers?

System.out.println("Value is - " + ((a < 5) ? "9.9" : "9"));

Patricia

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