parseInt() will force it to be type integer, or will be NaN (not a number) if it cannot perform the conversion. var currentValue = parseInt($(“#replies”).text(),10); The second paramter (radix) makes sure it is parsed as a decimal number.
Note that there is a difference between a cast to long and a cast to Long. If you cast to long (a primitive value) then it should be automatically boxed to a Long (the reference type that wraps it). You could alternatively use new to create an instance of Long, initializing it with the int … Read more
why doesn’t reinterpret_cast handle that for me? One reason is that the size, alignment, and bit representations aren’t specified, so such a conversion wouldn’t be portable. However, that wouldn’t really justify making the behaviour undefined, just implementation-defined. By making it undefined, the compiler is allowed to assume that expressions of unrelated types don’t access the … Read more
Even after fixing all other problems to make the code compile, it only works in VC2010 because it uses a non-standard extension. And If you specify /Wall to see all warnings, you compiler will emit warning C4213: nonstandard extension used : cast on l-value
I like using locate, which works on built-in types: >>> from pydoc import locate >>> locate(‘int’) <type ‘int’> >>> t = locate(‘int’) >>> t(‘1’) 1 …as well as anything it can find in the path: >>> locate(‘datetime.date’) <type ‘datetime.date’> >>> d = locate(‘datetime.date’) >>> d(2015, 4, 23) datetime.date(2015, 4, 23) …including your custom types: >>> … Read more
Cast when it’s really a type of int, Convert when it’s not an int but you want it to become one. For example int i = (int)o; when you know o is an int int i = Convert.ToInt32(“123″) because “123” is not an int, it’s a string representation of an int.
Just multiply one of the numbers by 1.0: SELECT something*1.0/total FROM somewhere That will give you floating point division instead of integer division.
First of all, you assume that sizeof(long) == sizeof(int) == sizeof(float). This is not always true, and totally unspecified (platform dependent). Actually, this is true on my Windows using clang-cl and wrong on my Linux using the same 64-bit machine. Different compilers on the same OS/machine can give different results. A static assert is at … Read more
[float(i) for i in lst] to be precise, it creates a new list with float values. Unlike the map approach it will work in py3k.
As always with these questions, the JLS holds the answer. In this case §15.26.2 Compound Assignment Operators. An extract: A compound assignment expression of the form E1 op= E2 is equivalent to E1 = (T)((E1) op (E2)), where T is the type of E1, except that E1 is evaluated only once. An example cited from §15.26.2 […] the following code is … Read more