Functions In C language | Built-In Functions | Part 15 | By L N Reddy B | Wisdom Jobs

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Functions In C language Built - In Functions : A function that is built into an application and can be accessed by end-users. For example, most spreadsheet applications support a built-in SUM function that adds up all cells in a row or column. The system provided these functions and stored in the library.
Therefore it is also called Library Functions. e.g. scanf(), printf(), strcpy, strlwr, strcmp, strlen, strcat etc. To use these functions, you just need to include the appropriate C header files. The standard library functions are built-in functions in C programming.
Hence, to use the printf() function, we need to include the stdio.h header file using include stdio.h. The sqrt() function calculates the square root of a number. The function is defined in the math.h header file.
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