string functions

Angol

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string functions (tsz. string functionses)

(informatika) Here is a summary comparison of common string functions across C, C++, Java, and Python, based on the detailed Wikipedia article you provided:

Function / Operation	C	C++ (STL)	Java	Python
CharAt (get char at index)	`str`	`string` or `string.at(i)`	`string.charAt(i)`	`string`
Compare (integer result)	`strcmp(str1, str2)`	`string1.compare(string2)`	`string1.compareTo(string2)`	`(str1 > str2) - (str1 < str2)`
Compare (relational operators)	`strcmp` + comparison	`==, !=, <, >, <=, >=`	`==, !=, <, >, <=, >=`	`==, !=, <, >, <=, >=`
Concatenate	`strcat(dest, src)`	`+`	`+`	`+`
Contains	`strstr(str, substr) != NULL`	`string.find(substr) != string::npos`	`string.contains(substr)`	`substr in string`
Equality	`strcmp(str1, str2) == 0`	`==`	`string1.equals(string2)`	`==`
Find (index of substr)	`strstr` returns pointer; calc index	`string.find(substr)`	`string.indexOf(substr)`	`string.find(substr)`
Find char	`strchr(str, ch)`	`string.find(ch)`	`string.indexOf(ch)`	`string.find(ch)`
Format	`sprintf(buf, fmt, args)`	`std::format(fmt, args)` (C++20)	`String.format(fmt, args)`	`f"..."`, `"{}".format()`, `%`
Inequality	`strcmp(str1, str2) != 0`	`!=`	`!string1.equals(string2)`	`!=`
Join	manual	`string.join(separator)`	`String.join(separator, list)`	`separator.join(list)`
Left	manual via `strncpy`	`string.substr(0, n)`	`string.substring(0, n)`	`string`
Length	`strlen(str)`	`string.length()`	`string.length()`	`len(string)`
Lowercase	loop + `tolower()`	`std::transform` or Boost	`string.toLowerCase()`	`string.lower()`
Partition	manual	manual	manual	`string.partition(sep)`
Replace	manual	`string.replace()`	`string.replace()` or `replaceAll()`	`string.replace()`
Reverse	manual	`std::reverse` or Boost	`new StringBuilder(string).reverse().toString()`	`string`
Rfind (last index of substr)	manual	`string.rfind(substr)`	`string.lastIndexOf(substr)`	`string.rfind(substr)`
Right	manual	`string.substr(len - n)`	`string.substring(len - n)`	`string`
Rpartition	manual	manual	manual	`string.rpartition(sep)`
Split	manual	`string.split(sep)`	`string.split(sep)`	`string.split(sep)`
Substring	manual via `strncpy` or pointer math	`string.substr(start, len)`	`string.substring(start, end)`	`string`
Uppercase	loop + `toupper()`	`std::transform` or Boost	`string.toUpperCase()`	`string.upper()`
Trim	manual	Boost `trim_copy`	`string.trim()`	`string.strip()`

Key Points:

C:
- Strings are mutable C-style char arrays.
- No native object support → all string operations are manual or via standard C library (e.g., strlen, strcmp, strcpy, strstr).
- Memory safety is an issue (manual buffer handling).
C++:
- std::string provides many modern methods (length, substr, find, rfind, compare, etc.).
- Since C++20: std::format and string.contains() added.
- Boost and Qt provide richer string utilities.
Java:
- Strings are immutable.
- Rich String class: length(), substring(), indexOf(), contains(), replace(), toLowerCase(), split(), etc.
- StringBuilder or StringBuffer used for mutable string operations.
Python:
- Strings are immutable.
- Very rich and pythonic syntax: slicing, in keyword for contains, easy split, join, strip, replace, lower, upper, partition.
- f-strings for formatting since Python 3.6.

További információk

string functions - Szótár.net (en-hu)
string functions - Sztaki (en-hu)
string functions - Merriam–Webster
string functions - Cambridge
string functions - WordNet
string functions - Яндекс (en-ru)
string functions - Google (en-hu)
string functions - Wikidata
string functions - Wikipédia (angol)

string functions

Angol

Főnév

Key Points:

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