Create Header File Dev C++
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-->Nov 06, 2019 Create a new file (in Dev C) and save it as lab11XYZ.cpp (replace XYZ with your initials). Create ANOTHER new file (in Dev C) and save it as swapXYZ.h (replace XYZ with your initials). Use the swapXYZ.h header file to define a set of functions for swapping two items of the same type. Given the following prototypes, define (overloaded) swap functions. Header files in dev-C. Ask Question Asked 11 years ago. Active 2 years, 3 months ago. Viewed 64k times 3. I'm trying to add an header file to dev-C but when I compile it it doesn't work. Here are my exact steps (for my example, I'm trying to get mysql.h to work). How do I create a Java string from the contents of a file? 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. C standard library header files.; 2 minutes to read +1; In this article. Header files for the C standard library and extensions, by category. Headers by category. 11 Added in the C11 standard. 14 Added in the C14 standard. 17 Added in the C17 standard. 20 Added in the draft C. In this article I am going to tell you the easiest way to create your own header files in programming languages like C and C. For this you do not have to be an expert. This can be done by anyone who has just started learning programming languages. Before starting the process let me Read More ».
Header files for the C++ standard library and extensions, by category.
Headers by category
Creating Header File C
| 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.
| 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
Using C++ library headers
C++ standard library
The names of program elements such as variables, functions, classes, and so on must be declared before they can be used. For example, you can't just write x = 42 without first declaring 'x'.
The declaration tells the compiler whether the element is an int, a double, a function, a class or some other thing. Furthermore, each name must be declared (directly or indirectly) in every .cpp file in which it is used. When you compile a program, each .cpp file is compiled independently into a compilation unit. The compiler has no knowledge of what names are declared in other compilation units. That means that if you define a class or function or global variable, you must provide a declaration of that thing in each additional .cpp file that uses it. Each declaration of that thing must be exactly identical in all files. A slight inconsistency will cause errors, or unintended behavior, when the linker attempts to merge all the compilation units into a single program.
To minimize the potential for errors, C++ has adopted the convention of using header files to contain declarations. You make the declarations in a header file, then use the #include directive in every .cpp file or other header file that requires that declaration. The #include directive inserts a copy of the header file directly into the .cpp file prior to compilation.
Note
In Visual Studio 2019, the C++20 modules feature is introduced as an improvement and eventual replacement for header files. For more information, see Overview of modules in C++.
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Example
The following example shows a common way to declare a class and then use it in a different source file. We'll start with the header file, my_class.h. It contains a class definition, but note that the definition is incomplete; the member function do_something is not defined:
Next, create an implementation file (typically with a .cpp or similar extension). We'll call the file my_class.cpp and provide a definition for the member declaration. We add an #include directive for 'my_class.h' file in order to have the my_class declaration inserted at this point in the .cpp file, and we include <iostream> to pull in the declaration for std::cout. Note that quotes are used for header files in the same directory as the source file, and angle brackets are used for standard library headers. Also, many standard library headers do not have .h or any other file extension.
In the implementation file, we can optionally use a using statement to avoid having to qualify every mention of 'my_class' or 'cout' with 'N::' or 'std::'. Don't put using statements in your header files!
Now we can use my_class in another .cpp file. We #include the header file so that the compiler pulls in the declaration. All the compiler needs to know is that my_class is a class that has a public member function called do_something().
After the compiler finishes compiling each .cpp file into .obj files, it passes the .obj files to the linker. When the linker merges the object files it finds exactly one definition for my_class; it is in the .obj file produced for my_class.cpp, and the build succeeds.
Include guards
C++ Header File Tutorial
Typically, header files have an include guard or a #pragma once directive to ensure that they are not inserted multiple times into a single .cpp file.
What to put in a header file
Because a header file might potentially be included by multiple files, it cannot contain definitions that might produce multiple definitions of the same name. The following are not allowed, or are considered very bad practice:
- built-in type definitions at namespace or global scope
- non-inline function definitions
- non-const variable definitions
- aggregate definitions
- unnamed namespaces
- using directives
Use of the using directive will not necessarily cause an error, but can potentially cause a problem because it brings the namespace into scope in every .cpp file that directly or indirectly includes that header.
Create Header File In Dev C++
Sample header file
C++ Header Files Pdf
The following example shows the various kinds of declarations and definitions that are allowed in a header file: