Dev C++ String Functions

Posted : admin On 28.12.2020

Get string length. Returns the length of the C string str. The length of a C string is determined by the terminating null-character: A C string is as long as the number of characters between the beginning of the string and the terminating null character (without including the terminating null character itself).

< cpp

C# String Functions Substring

C++

Language
Standard Library Headers
Freestanding and hosted implementations
Named requirements
Language support library
Concepts library(C++20)
Diagnostics library
Utilities library
Strings library
Containers library
Iterators library
Ranges library(C++20)
Algorithms library
Numerics library
Input/output library
Localizations library
Regular expressions library(C++11)
Atomic operations library(C++11)
Thread support library(C++11)
Filesystem library(C++17)
Technical Specifications

For C strings, there's no reason to use strlen. Just use string::length: cout str.length strlen(str.cstr) for the following reasons: Clarity: The length (or size) member functions unambiguously give back the length of the string.
C Structure and Function. In this article, you'll find relevant examples to pass structures as an argument to a function, and use them in your program. Structure variables can be passed to a function and returned in a similar way as normal arguments. A structure variable can be passed to a function in similar way as normal argument.

Strings library

Null-terminated strings
Byte strings
Multibyte strings
Wide strings
Classes
(C++17)

The C++ strings library includes support for three general types of strings:

std::basic_string - a templated class designed to manipulate strings of any character type.
std::basic_string_view(C++17) - a lightweight non-owning read-only view into a subsequence of a string.
Null-terminated strings - arrays of characters terminated by a special null character.

4Additional support

[edit]std::basic_string

The templated class std::basic_string generalizes how sequences of characters are manipulated and stored. String creation, manipulation, and destruction are all handled by a convenient set of class methods and related functions.

Several specializations of std::basic_string are provided for commonly-used types:

Type	Definition
std::string	std::basic_string<char>
std::wstring	std::basic_string<wchar_t>
std::u8string(since C++20)	std::basic_string<char8_t>
std::u16string(since C++11)	std::basic_string<char16_t>
std::u32string(since C++11)	std::basic_string<char32_t>

`std::basic_string_view`

The templated class std::basic_string_view provides a lightweight object that offers read-only access to a string or a part of a string using an interface similar to the interface of std::basic_string.

Several specializations of std::basic_string_view are provided for commonly-used types:

Defined in header `<string>`
Type	Definition
std::string_view(since C++17)	std::basic_string_view<char>
std::wstring_view(since C++17)	std::basic_string_view<wchar_t>
std::u8string_view(since C++20)	std::basic_string_view<char8_t>
std::u16string_view(since C++17)	std::basic_string_view<char16_t>
std::u32string_view(since C++17)	std::basic_string_view<char32_t>

(since C++17)

[edit] Null-terminated strings

Null-terminated strings are arrays of characters that are terminated by a special null character. C++ provides functions to create, inspect, and modify null-terminated strings.

There are three types of null-terminated strings:

[edit] Additional support

[edit]std::char_traits

The string library also provides class template std::char_traits that defines types and functions for std::basic_stringand std::basic_string_view(since C++17). The following specializations are defined: /little-snitch-deal.html.

template<>class char_traits<char>;
template<>class char_traits<char8_t>;	(since C++20)
(since C++11)
template<>class char_traits<char32_t>;	(since C++11)