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String concatenation vs. string substitution in Python
In Python, the where and when of using string concatenation versus string substitution eludes me. As the string concatenation has seen large boosts in performance, is this (becoming more) a stylistic decision rather than a practical one?
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How can I programmatically get the MAC address of an iphone
... to use it
InitAddresses();
GetIPAddresses();
GetHWAddresses();
int i;
NSString *deviceIP = nil;
for (i=0; i<MAXADDRS; ++i)
{
static unsigned long localHost = 0x7F000001; // 127.0.0.1
unsigned long theAddr;
theAddr = ip_addrs[i];
if (theAddr == 0) break;
if (theAddr...
Undefined reference to static constexpr char[]
...n initializer.
So then the question becomes, is baz odr-used here:
std::string str(baz);
and the answer is yes, and so we require a namespace scope definition as well.
So how do we determine if a variable is odr-used? The original C++11 wording in section 3.2 [basic.def.odr] says:
An expr...
How Do I Choose Between a Hash Table and a Trie (Prefix Tree)?
...f hash table and trie have the same complexity on query, O(k) for k length string why should we go for hash? could you please explain?
– Sazzad Hissain Khan
Feb 12 '18 at 4:00
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How can I hash a password in Java?
...der enc = Base64.getEncoder();
System.out.printf("salt: %s%n", enc.encodeToString(salt));
System.out.printf("hash: %s%n", enc.encodeToString(hash));
Here's a utility class that you can use for PBKDF2 password authentication:
import java.security.NoSuchAlgorithmException;
import java.security.Secu...
How to check if character is a letter in Javascript?
I am extracting a character in a Javascript string with:
14 Answers
14
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How can I remove a character from a string using Javascript?
...st isn't right.
All I would like to do is remove the character r from a string.
The problem is, there is more than one instance of r in the string.
However, it is always the character at index 4 (so the 5th character).
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Obfuscated C Code Contest 2006. Please explain sykes2.c
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__TIME__ is a special macro defined by the preprocessor. It expands to a string constant containing the time at which the preprocessor was run, in the form "HH:MM:SS". Observe that it contains exactly 8 characters. Note that 0-9 have ASCII values 48 through 57 and : has ASCII value 58. The output ...
How to achieve function overloading in C?
...ce, and you need to mess about a bit if you want your overloads to support string literals. Still overall pretty cool though.
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'printf' vs. 'cout' in C++
...t use different syntax. printf uses standard function syntax using pattern string and variable-length argument lists. Actually, printf is a reason why C has them - printf formats are too complex to be usable without them. However, std::cout uses a different API - the operator << API that retur...