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by Weiqi Gao.
Original Post: 1.03 - .42 = ?
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Item 31 of Joshua Bloch's Effective Java reads:
Avoid float and double if exact answers are required
And as an example, he used the following example:
System.out.println(1.03 - .42);
which prints
I understand the reasoning behind the advice. No problem there.
Out of curiosity, I tried similar expressions in several different languages that's available on my Fedora Core 2 box. And the result is fascinating:
Language Expression Result
C#
Console.WriteLine(1.03 - .42); 0.61
C++
std::cout << 1.03 - 0.42 << std::endl; 0.61
Perl
print(1.03 - .42); 0.61
Python
print(1.03 - .42) 0.61
Ruby
print(1.03 - 0.42) 0.61
Guile
(display (- 1.03 .42)) 0.61
What is going on here?
Read: 1.03 - .42 = ?
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