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Java recursive Fibonacci sequence
...(4) = fibonacci(3) + fibonacci(2)
fibonacci(2) = fibonacci(1) + fibonacci(0)
Now you already know fibonacci(1)==1 and fibonacci(0) == 0. So, you can subsequently calculate the other values.
Now,
fibonacci(2) = 1+0 = 1
fibonacci(3) = 1+1 = 2
fibonacci(4) = 2+1 = 3
fibonacci(5) = 3+2 = 5
And fr...
Why does GCC generate 15-20% faster code if I optimize for size instead of speed?
I first noticed in 2009 that GCC (at least on my projects and on my machines) have the tendency to generate noticeably faster code if I optimize for size ( -Os ) instead of speed ( -O2 or -O3 ), and I have been wondering ever since why.
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What do “branch”, “tag” and “trunk” mean in Subversion repositories?
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answered Aug 19 '08 at 13:35
Jon LimjapJon Limjap
87.7k1414 gold badges9494 silver badges147147 bronze badges
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For i = 0, why is (i += i++) equal to 0?
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This:
int i = 0;
i += i++
Can be seen as you doing (the following is a gross oversimplification):
int i = 0;
i = i + i; // i=0 because the ++ is a postfix operator and hasn't been executed
i + 1; // Note that you are discarding the calc...
Why does Math.round(0.49999999999999994) return 1?
...n see that each value slightly less than .5 is rounded down, except for 0.5 .
5 Answers
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Cannot ping AWS EC2 instance
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answered May 30 '15 at 9:39
RakibRakib
8,9821010 gold badges5555 silver badges9090 bronze badges
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How to scale down a range of numbers with a known min and max value
...l. I want the height and width of each ellipse to be in a range of say 1-30. I have methods that find the minimum and maximum values from my data set, but I won't have the min and max until runtime. Is there an easy way to do this?
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What is the best way to compute trending topics or tags?
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104
This problem calls for a z-score or standard score, which will take into account the historical...
How to print a number with commas as thousands separators in JavaScript
... ====>"} ${x} => ${result}`);
return pass;
}
let failures = 0;
failures += !test(0, "0");
failures += !test(100, "100");
failures += !test(1000, "1,000");
failures += !test(10000, "10,000");
failures += !test(100000, "100,000");
failures += !test(1000000, "...
Replace all non Alpha Numeric characters, New Lines, and multiple White Space with one Space
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Be aware, that \W leaves the underscore. A short equivalent for [^a-zA-Z0-9] would be [\W_]
text.replace(/[\W_]+/g," ");
\W is the negation of shorthand \w for [A-Za-z0-9_] word characters (including the underscore)
Example at regex101.com
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