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What does the comma operator , do?
...ariables used in a for loop, and it gives the following example:
void rev(char *s, size_t len)
{
char *first;
for ( first = s, s += len - 1; s >= first; --s)
/*^^^^^^^^^^^^^^^^^^^^^^^*/
putchar(*s);
}
Otherwise there are not many great uses of the comma operator, although it i...
Which is faster : if (bool) or if(int)?
... @Nathan: No. C++ has no bit data types. The smallest type is char, which is a byte by definition, and is the smallest addressable unit. bool's size is implementation-defined, and may be 1, 4, or 8, or whatever. Compilers tend to make it one, though.
– GManNickG
...
Default template arguments for function templates
...late <typename T> T prettify(T t) { return t; }
std::string prettify(char c) {
std::stringstream ss;
if (isprint((unsigned char)c)) {
ss << "'" << c << "'";
} else {
ss << (int)c;
}
return ss.str();
}
template <typename S, typena...
What is the maximum length of a URL in different browsers?
...
Short answer - de facto limit of 2000 characters
If you keep URLs under 2000 characters, they'll work in virtually any combination of client and server software.
If you are targeting particular browsers, see below for more details specific limits.
Longer answer -...
What is the MySQL VARCHAR max size?
I would like to know what the max size is for a MySQL VARCHAR type.
7 Answers
7
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What breaking changes are introduced in C++11?
...hose for others to elaborate on.
Core language
#define u8 "abc"
const char *s = u8"def"; // Previously "abcdef", now "def"
#define _x "there"
"hello"_x // now a user-defined-string-literal. Previously, expanded _x .
New keywords: alignas, alignof, char16_t, char32_t, constexpr, declt...
How to delete duplicate lines in a file without sorting it in Unix?
... <sniff> makes me sad. ;) Anyways, [ -~] represents a range of ASCII characters from 0x20 (space) to 0x7E (tilde). These are considered the printable ASCII characters (linked page also has 0x7F/delete but that doesn't seem right). That makes the solution broken for anyone not using ASCII or an...
Regex doesn't work in String.matches()
...wercase letters, you can use .matches(), but you need to match one or more characters: append a + to your character class, as in [a-z]+. Or use ^[a-z]+$ and .find().
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SQL ON DELETE CASCADE, Which Way Does the Deletion Occur?
...ould restructure your schema into this,
CREATE TABLE Categories
(
Code CHAR(4) NOT NULL PRIMARY KEY,
CategoryName VARCHAR(63) NOT NULL UNIQUE
);
CREATE TABLE Courses
(
CourseID INT NOT NULL PRIMARY KEY,
BookID INT NOT NULL,
CatCode CHAR(4) NOT NULL,
CourseNum CHAR(3) NOT NULL,
Cour...
Check if a String contains numbers Java
...
To explain: .* means any character from 0 to infinite occurence, than the \\d+ (double backslash I think is just to escape the second backslash) and \d+ means a digit from 1 time to infinite.
– Giudark
Sep 29 '1...