There are three options: >>> 4 / float(100) 0.04 >>> 4 / 100.0 0.04 which is the same behavior as the C, C++, Java etc, or >>> from __future__ import division >>> 4 / 100 0.04 You can also activate this behavior by passing the argument -Qnew to the Python interpreter: $ python -Qnew >>> … Read more
If it was the exit code and not the result, you could just use if func arg; then … If you cannot make the function return a proper exit code (with return N), and you have to use string results, use Alex Gitelman’s answer. $ help if: if: if COMMANDS; then COMMANDS; [ elif COMMANDS; … Read more
That is taking the parameter by reference. So in the first case you are taking a pointer parameter by reference so whatever modification you do to the value of the pointer is reflected outside the function. Second is the simlilar to first one with the only difference being that it is a double pointer. See … Read more
Put simply, . is function composition, just like in math: f (g x) = (f . g) x In your case, you are creating a new function, sumEuler that could also be defined like this: sumEuler x = sum (map euler (mkList x)) The style in your example is called “point-free” style — the arguments … Read more
Brace expansion, {x..y} is performed before other expansions, so you cannot use that for variable length sequences. Instead, use the seq 2 $max method as user mob stated. So, for your example it would be: max=10 for i in `seq 2 $max` do echo “$i” done
Is there syntax for moving fields between similar structs? No. There is no such syntax. The current implementation of “struct update” (previously called “functional record update”) syntax only allows the exact same type. Is there better syntax for this somewhere, or a better way to implement these map-like methods for non-trivial structs? No. The only … Read more
Foreword The only exception explicitly raised by the decoding code is json.JSONDecodeError, so the exception type does not help diagnose problems. What’s interesting is the associated message. However, it is possible that decoding bytes to text fails, before JSON decoding can be attempted. That is a separate issue beyond the scope of this post. It’s … Read more
int (*getFunc())(int, int) { … } That provides the declaration you requested. Additionally, as ola1olsson notes, it would be good to insert void: int (*getFunc(void))(int, int) { … } This says that getFunc may not take any parameters, which can help avoid errors such as somebody inadvertently writing getFunc(x, y) instead of getFunc()(x, y).
Example#Foo is called a type projection and will match any type Foo of any enclosing instance of type Example. If you write a type Example.Foo, the compiler will look for the value (and not type) called Example and will refer to its enclosing Foo type only. This is often used in the context of singleton … Read more
It allows a variable number of arguments of unspecified type (like printf does). You have to access the arguments with the va_start, va_arg and va_end functions. See http://publications.gbdirect.co.uk/c_book/chapter9/stdarg.html or Where in the C standard variadic functions are described? for more information