Because \ begin escape sequences only when they are valid escape sequences. >>> ‘\n’ ‘\n’ >>> r’\n’ ‘\\n’ >>> print ‘\n’ >>> print r’\n’ \n >>> ‘\s’ ‘\\s’ >>> r’\s’ ‘\\s’ >>> print ‘\s’ \s >>> print r’\s’ \s Unless an ‘r’ or ‘R’ prefix is present, escape sequences in strings are interpreted according to … Read more
As far as C++ is concerned: C++11, [lex.icon] ΒΆ2 The type of an integer literal is the first of the corresponding list in Table 6 in which its value can be represented. And Table 6, for literals without suffixes and decimal constants, gives: int long int long long int (interestingly, for hexadecimal or octal constants … Read more
The r means that the string is to be treated as a raw string, which means all escape codes will be ignored. For an example: ‘\n’ will be treated as a newline character, while r’\n’ will be treated as the characters \ followed by n. When an ‘r’ or ‘R’ prefix is present, a character … Read more
They are of type char[N] where N is the number of characters including the terminating \0. So yes you can assign them to char*, but you still cannot write to them (the effect will be undefined). Wrt argv: It points to an array of pointers to strings. Those strings are explicitly modifiable. You can change … Read more
Primitives are a different kind of type than objects created from within Javascript. From the Mozilla API docs: var color1 = new String(“green”); color1 instanceof String; // returns true var color2 = “coral”; color2 instanceof String; // returns false (color2 is not a String object) I can’t find any way to construct primitive types with … Read more
You can’t due to type erasure. Java generics are little more than syntactic sugar for Object casts. To demonstrate: List<Integer> list1 = new ArrayList<Integer>(); List<String> list2 = (List<String>)list1; list2.add(“foo”); // perfectly legal The only instance where generic type information is retained at runtime is with Field.getGenericType() if interrogating a class’s members via reflection. All of … Read more
The whole misconception about python’s raw strings is that most of people think that backslash (within a raw string) is just a regular character as all others. It is NOT. The key to understand is this python’s tutorial sequence: When an ‘r‘ or ‘R‘ prefix is present, a character following a backslash is included in … Read more
It makes it easier to pick out values in a memory dump. Example: enum state { waiting, running, stopped }; vs. enum state { waiting = ‘wait’, running = ‘run.’, stopped = ‘stop’ }; a memory dump after the following statement: s = stopped; might look like: 00 00 00 02 . . . . … Read more
Use a duplicated double quote. @”this “”word”” is escaped”; outputs: this “word” is escaped