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float or double

 
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This is a RHE question.
In the code fragment below, what are the legal data types for the variable "answer"?
byte b = 1;
char c = 2;
short s = 3;
int i = 4;
float f = 5f;
answer = b * c * s * i * f;

Correct selection is: FLOAT OR DOUBLE
The result of the multiple arithmetic is either int or the widest of the operand types, whichever is wider. Here the widest operand type is float, which is wider than int, so the result type is float. The variable answer may be float or any type that is wider than float. The only type that is wider than float is double.
Problem: well, I choose float only because float is wider. I don�t think double is ccorect
But they have given double.
Thanks in advance
Padmini
 
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I think they say float or double because double would also work. The result of the expression would be float but that can be cast to double.
Bill
 
padmini Babu
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Originally posted by William Brogden:
I think they say float or double because double would also work. The result of the expression would be float but that can be cast to double.
Bill


___________________________________________________________
Thanks william, But i think the answer is very unclear.
Becuase , in case i get a problem where the answer is only short(well this is an eg) , then should my reply be short, int, long, float and double just because short can be casted to an int , long , float and double too???
Thanks once again for your attention
Padmini.

 
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hi,
i think you're right, though don't forget the automatic promotion rules when looking at expressions, it seems most smaller than int expressions will promote to size int, so usually answer will be int, long, float, double, unless you're dealing with a single term ( I may be corrected here )
e.g
b=25
I would answer b could be byte, char, short, int, float, double.
An interesting question would be
b=32768?
char, int, float, double.
just include all types bigger than the smallest type of the result.
cheers.

 
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