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Struct Constructor in C++?
...s.
struct blocknode
{
unsigned int bsize;
bool free;
unsigned char *bptr;
blocknode *next;
blocknode *prev;
blocknode(unsigned int sz, unsigned char *b, bool f = true,
blocknode *p = 0, blocknode *n = 0) :
bsize(sz), free(f), bptr(b), prev(p), ne...
node.js execute system command synchronously
...2012: How to get STDOUT]
var lib = ffi.Library(null, {
// FILE* popen(char* cmd, char* mode);
popen: ['pointer', ['string', 'string']],
// void pclose(FILE* fp);
pclose: ['void', [ 'pointer']],
// char* fgets(char* buff, int buff, in)
fgets: ['string', ['string', 'int','po...
Windows batch: echo without new line
... faster is <nul set /p =Hello. set /p can't echo an equal sign as first character nor spaces/tabs.
– jeb
Aug 18 '11 at 18:23
...
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...
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...
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?
...
std::cin input with spaces?
...
You have to use cin.getline():
char input[100];
cin.getline(input,sizeof(input));
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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...
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...
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
...