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What does the explicit keyword mean?
...cidental construction that can hide bugs.
Contrived example:
You have a MyString(int size) class with a constructor that constructs a string of the given size. You have a function print(const MyString&), and you call print(3) (when you actually intended to call print("3")). You expect it to p...
Best way to reverse a string
I've just had to write a string reverse function in C# 2.0 (i.e. LINQ not available) and came up with this:
48 Answers
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Avoid trailing zeroes in printf()
...01357
breaks it.
What you can do is to sprintf("%.20g") the number to a string buffer then manipulate the string to only have N characters past the decimal point.
Assuming your number is in the variable num, the following function will remove all but the first N decimals, then strip off the trai...
Generating a random password in php
...tor. Look elsewhere for generating a cryptographically secure pseudorandom string in PHP.
Try this (use strlen instead of count, because count on a string is always 1):
function randomPassword() {
$alphabet = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890';
$pass = array(...
How can I check if a single character appears in a string?
...
You can use string.indexOf('a').
If the char a is present in string :
it returns the the index of the first occurrence of the character in
the character sequence represented by this object, or -1 if the
character does not occur...
Delete last char of string
... lot of information in a list, linked to a database and I want to create a string of groups, for someone who is connected to the website.
...
Efficient Algorithm for Bit Reversal (from MSB->LSB to LSB->MSB) in C
...eversed bits of v; first get LSB of v
int s = sizeof(v) * CHAR_BIT - 1; // extra shift needed at end
for (v >>= 1; v; v >>= 1)
{
r <<= 1;
r |= v & 1;
s--;
}
r <<= s; // shift when v's highest bits are zero
Faster (32-bit processor)
unsigned char b = x;
b = ((...
What is std::string::c_str() lifetime?
...
The c_str() result becomes invalid if the std::string is destroyed or if a non-const member function of the string is called. So, usually you will want to make a copy of it if you need to keep it around.
In the case of your example, it appears that the results of c_str(...
What is a rune?
...rom this (erroneous) assumption C treated characters as 'bytes' char, and 'strings' as a 'sequence of characters' char*.
But guess what. There are many other symbols invented by humans other than the 'abcde..' symbols. And there are so many that we need 32 bit to encode them.
In golang then a st...
What's the easiest way to escape HTML in Python?
...gt;b&#225;&lt;/a&gt;
Also worth of note (thanks Greg) is the extra quote parameter cgi.escape takes. With it set to True, cgi.escape also escapes double quote chars (") so you can use the resulting value in a XML/HTML attribute.
EDIT: Note that cgi.escape has been deprecated in Python...