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Pointers in C: when to use the ampersand and the asterisk?

...'t use the & operator for arguments corresponding to "%s" in scanf(): char str[STRING_LENGTH]; ... scanf("%s", str); Because of the implicit conversion, scanf() receives a char * value that points to the beginning of the str array. This holds true for any function called with an array expres...
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What is the difference between memmove and memcpy?

... memmove can handle overlapping memory, memcpy can't. Consider char[] str = "foo-bar"; memcpy(&str[3],&str[4],4); //might blow up Obviously the source and destination now overlap, we're overwriting "-bar" with "bar". It's undefined behavior using memcpy if the source and destin...
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Convert UTF-8 encoded NSData to NSString

...ver and I want to convert it to NSString for iPhone. Since data contains characters (like a degree symbol) which have different values on both platforms, how do I convert data to string? ...
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std::cin input with spaces?

... You have to use cin.getline(): char input[100]; cin.getline(input,sizeof(input)); share | improve this answer | follow ...
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Passing an array by reference

...an be passed by reference OR by degrading to a pointer. For example, using char arr[1]; foo(char arr[])., arr degrades to a pointer; while using char arr[1]; foo(char (&arr)[1]), arr is passed as a reference. It's notable that the former form is often regarded as ill-formed since the dimension...
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Is Python strongly typed?

...g access to the underlying representation. In C, I can create a pointer to characters, then tell the compiler I want to use it as a pointer to integers: char sz[] = "abcdefg"; int *i = (int *)sz; On a little-endian platform with 32-bit integers, this makes i into an array of the numbers 0x6463626...
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Difference between one-to-many and many-to-one relationship

... Bar references Foo Not the other way around CREATE TABLE Foo ( Foo CHAR(10) NOT NULL, -- primary key Name CHAR(30) NOT NULL CONSTRAINT PK -- constraint name PRIMARY KEY (Foo) -- pk ) CREATE TABLE Bar ( Bar CHAR(10) NOT NULL, -- primary key ...
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Checking if a string array contains a value, and if so, getting its position

... How do I check individual values? When I tried checking a char array for a char, I got a message that char can't be converted to System.Predicate<char> – Aaron Franke May 27 at 15:09 ...
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Concept of void pointer in C programming

...l incorrectly, you can safely dereference a void* in two ways. Casting to char* is always acceptable, and if you know the original type it points to you can cast to that type. The void* has lost the type info so it'd have to be stored elsewhere. – Dan Olson M...
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invalid multibyte char (US-ASCII) with Rails and Ruby 1.9

...ave you tried adding a magic comment in the script where you use non-ASCII chars? It should go on top of the script. #!/bin/env ruby # encoding: utf-8 It worked for me like a charm. share | impro...