Q: In the following code, what are the legal type types for the variable vari, which is declared on line 2? 1. class C { 2. public ??? vari; 3. public static void main(String[] args) { 4. foo(vari); 5. } 6. static void foo(float f){ 7. System.out.println("f=" + f); 8. } 9. } a) boolean b) byte c) char d) double e) float f) int g) long h) short I think the answers are b,c,e,f,h. but the correct answers are b,c,e,f,g,h. I compile the g answer, it is really ok, I don't know why. Can someone help me?
I want to know
Bin Wang
Greenhorn
Joined: Mar 04, 2002
Posts: 5
posted
0
in g, type long to float is implicit windening conversion,even they have same length. so it is correct.
Bin Wang
Greenhorn
Joined: Mar 04, 2002
Posts: 5
posted
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sorry, type long to float is implicit windening conversion,even length of long is 64 and float is 32.
yuelan
Greenhorn
Joined: Apr 25, 2002
Posts: 2
posted
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The conversion is legal because the 32 bits for a float number are divided into two fields: one for magnititude, one for precision and thus the range of a float number is definitely wider than a long number. But note the conversion may result in the loss of accuracy for some large long number.
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