Header file have an extension '.h' which contains C function declaration and macro definition. Each header file contains information (or declarations) for a particular group of functions. Like stdio.h header file contains declarations of standard input and output functions available in C which is used for get the input and print the output.
Hi All,
I am literally just beginning learning C++, following a beginners 21 day tutorial.. so have no one I can ask these questions - other than you all!
I'm learning about 'class declaration and function definition'..
So far my .cpp files have contained the class declaration and the class method / function definition.. now I'm splitting the class declaration into a header file and leaving the fuction definition in my .cpp file along with my main() function.. This seems silly as each time I would ever want to use the header file and #include it in any new .cpp file I create, I would have to list all the function definitions again..
I was under the impression creating a header file was so others using the class (from the header file) wouldn't need to know how the functions work internally but could work out enough from the header file to realise what functions / methods a class has and is available for them to use.. but if they then need to code all the function definitions into their .cpp file it seems pointless.
In the real programming world, would you create and declare a class in a header file and create only those function definitions in its related .cpp file ie the file wouldn't contain a main() function etc
I was wondering if I'm simply getting confused because all the .cpp files we create in the tutorial obviously start with main() to demonstrate the particular issue we are studying.
I am literally just beginning learning C++, following a beginners 21 day tutorial.. so have no one I can ask these questions - other than you all!
I'm learning about 'class declaration and function definition'..
So far my .cpp files have contained the class declaration and the class method / function definition.. now I'm splitting the class declaration into a header file and leaving the fuction definition in my .cpp file along with my main() function.. This seems silly as each time I would ever want to use the header file and #include it in any new .cpp file I create, I would have to list all the function definitions again..
I was under the impression creating a header file was so others using the class (from the header file) wouldn't need to know how the functions work internally but could work out enough from the header file to realise what functions / methods a class has and is available for them to use.. but if they then need to code all the function definitions into their .cpp file it seems pointless.
In the real programming world, would you create and declare a class in a header file and create only those function definitions in its related .cpp file ie the file wouldn't contain a main() function etc
I was wondering if I'm simply getting confused because all the .cpp files we create in the tutorial obviously start with main() to demonstrate the particular issue we are studying.
- Install Dev-C. I installed from the Version 4.9.9.2 Setup File. Download graphics.h to the include/ subdirectory of the Dev-C directories. Download libbgi.a to the lib/ In order to use the WinBGIm subdirectory of the Dev-C directories. Whenever you #include in a program, you must instruct the linker to link in certain libraries.
- 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.
- Jun 16, 2014 That cpp file contains the definitions of the function belonging to the class defined in the h file. The class header and cpp files could be used in multiple programs, so you wouldn't want a main function in them. The main function will be in the program that uses the class. Here's a short example of three files.
- 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.
- Nov 29, 2016 Download Dev-C for free. A free, portable, fast and simple C/C IDE. A new and improved fork of Bloodshed Dev-C.
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> |
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.
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.
C++ Header Files List
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> |
See also
Header File And C File
Using C++ library headers
C++ standard library
C++ standard library