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Built-in types (int, char, double etc) are not defined in headers, because they are built-in types.

Header files contain data-definitions and function-prototypes (those may include compiler-specific informations, like __attribute__), but not function implementations. If you are interested in the source code of library functions like printf, you have to do some Google search.

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Q: How c recognize keywords or predefined functions?
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Related questions

What is the difference between pre defined functions and user defined functions?

Predefined functions are functions that have been written and we can use them in our C++ statements. But we must know how to use each of these predefined functions.


Why you use utility function in c?

I guess you mean predefined functions or library functions. Well, you don't have to use them, but they can be useful.


What is a Generic Function in c plus plus?

Predefined functions are built-in functions that perform standard operations and that generally do not depend on any classes. A predefined void function is simply a predefined function that has no return value. An example of a predefined void function is the abort() function which typically has the following signature: void abort(void);


What are predefined codes?

Predefined codes or the predefined functions are the codes small or large codes which are predefined by the maker of the language. In C++ the predefined codes can be included in the program by the header files. These codes are placed in files and functions could be used to access them. Like a simple console Code to output "Hello World" uses a predefined code cout


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it is predefined function


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yes


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How many keyword are present in C?

32 keywords are present in C language. There are 44 keywords in C99.


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Turbo C plus plus keywords?

Turbo C++ keywords are the same as C++ keywords. The language remains the same, only the implementations differ. The Turbo C++ implementations were standards-compliant at the time of their release, but the product is no longer supported.


Why C language called middle level language?

because it has instrictions and functions with keywords which resemble its meaning in english.the keywords are very similar to the task they are used for.for example printf to give output.but it is not as simple as basic which is a high level language.


How may keywords in c?

15