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Header files for the C++ standard library and extensions, by category.

Headers by category

Category	Headers
Algorithms	<algorithm>, <cstdlib>, <numeric>
Atomic operations	<atomic>11
C library wrappers	<cassert>, <ccomplex>11 a b, <cctype>, <cerrno>, <cfenv>11, <cfloat>, <cinttypes>11, <ciso646>b, <climits>, <clocale>, <cmath>, <csetjmp>, <csignal>, <cstdalign>11 a b, <cstdarg>, <cstdbool>11 a b, <cstddef>, <cstdint>11, <cstdio>, <cstdlib>, <cstring>, <ctgmath>11 a b, <ctime>, <cuchar>11, <cwchar>, <cwctype>
Concepts	<concepts>20
Containers
Sequence containers	<array>11, <deque>, <forward_list>11, <list>, <vector>
Ordered associative containers	<map>, <set>
Unordered associative containers	<unordered_map>11, <unordered_set>11
Container adaptors	<queue>, <stack>
Container views	<span>20
Errors and exception handling	<cassert>, <exception>, <stdexcept>, <system_error>11
General utilities	<any>17, <bitset>, <charconv>17, <cstdlib>, <execution>17, <functional>, <memory>, <memory_resource>17, <optional>17, <ratio>11, <scoped_allocator>11, <tuple>11, <type_traits>11, <typeindex>11, <utility>, <variant>17
I/O and formatting	<cinttypes>11, <cstdio>, <filesystem>17, <fstream>, <iomanip>, <ios>, <iosfwd>, <iostream>, <istream>, <ostream>, <sstream>, <streambuf>, <strstream>c, <syncstream>20
Iterators	<iterator>
Language support	<cfloat>, <climits>, <codecvt>11 a, <compare>20, <contract>20, <coroutine>20, <csetjmp>, <csignal>, <cstdarg>, <cstddef>, <cstdint>11, <cstdlib>, <exception>, <initializer_list>11, <limits>, <new>, <typeinfo>, <version>20
Localization	<clocale>, <codecvt>11 a, <cvt/wbuffer>, <cvt/wstring>, <locale>
Math and numerics	<bit>20, <cfenv>11, <cmath>, <complex>, <cstdlib>, <limits>, <numeric>, <random>11, <ratio>11, <valarray>
Memory management	<allocators>, <memory>, <memory_resource>17, <new>, <scoped_allocator>11
Multithreading	<atomic>11, <condition_variable>11, <future>11, <mutex>11, <shared_mutex>14, <thread>11
Ranges	<ranges>20
Regular expressions	<regex>11
Strings and character data	<cctype>, <cstdlib>, <cstring>, <cuchar>11, <cwchar>, <cwctype>, <regex>11, <string>, <string_view>17
Time	<chrono>11, <ctime>

Jul 03, 2019  There are many header files present in C and C. Even we can create them according to our requirement. In order to access the Standard Library functions, certain header files in C/C need to be included before writing the body of the program. C/C Header File. Let’s have a look at these Header files in C and C.

¹¹ Added in the C++11 standard.
¹⁴ Added in the C++14 standard.
¹⁷ Added in the C++17 standard.
²⁰ Added in the draft C++20 standard.
^a Deprecated in the C++17 standard.
^b Removed in the draft C++20 standard.
^c Deprecated in the C++98 standard.

Category	Headers
Algorithms	<algorithm>
C library wrappers	<cassert>, <cctype>, <cerrno>, <cfenv>, <cfloat>, <cinttypes>, <ciso646>, <climits>, <clocale>, <cmath>, <csetjmp>, <csignal>, <cstdarg>, <cstdbool>, <cstddef>, <cstdint>, <cstdio>, <cstdlib>, <cstring>, <ctgmath>, <ctime>, <cwchar>, <cwctype>
Containers
Sequence containers	<array>, <deque>, <forward_list>, <list>, <vector>
Ordered associative containers	<map>, <set>
Unordered associative containers	<unordered_map>, <unordered_set>
Adaptor containers	<queue>, <stack>
Errors and exception handling	<exception>, <stdexcept>, <system_error>
I/O and formatting	<filesystem>, <fstream>, <iomanip>, <ios>, <iosfwd>, <iostream>, <istream>, <ostream>, <sstream>, <streambuf>, <strstream>
Iterators	<iterator>
Localization	<codecvt>, <cvt/wbuffer>, <cvt/wstring>, <locale>
Math and numerics	<complex>, <limits>, <numeric>, <random>, <ratio>, <valarray>
Memory Management	<allocators>, <memory>, <new>, <scoped_allocator>
Multithreading	<atomic>, <condition_variable>, <future>, <mutex>, <shared_mutex>, <thread>
Other utilities	<bitset>, <chrono>, <functional>, <initializer_list>, <tuple>, <type_traits>, <typeinfo>, <typeindex>, <utility>
Strings and character data	<regex>, <string>, <string_view>

C++ Using Header Files

C code files (with a.cpp extension) are not the only files commonly seen in C programs. The other type of file is called a header file. Header files usually have a.h extension, but you will occasionally see them with a.hpp extension or no extension at all. The primary purpose of a header file is to propagate declarations to code files. A file that contains a class declaration is called header file. The name of the class is usually the same as the name of the class, with a.h extension. C Separate Header and Implementation Files Example.

Create Header File In Dev C++

See also

Using C++ library headers
C++ standard library