What are the standard pre-defined library functions in C Programming

A function is said to be a predefined function or library function, if they are already declared and defined by another developer. These predefined functions will be available in the library header files. So, if we want to use a predefined function, we have to include the respective header file in our program. For example, if we want to use printf function in our program, we have to include the stdio.h header file, as the function printf has been declared inside it. Some of the header files in C are: Some of the predefined functions available in ctype.h header file

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What are the standard pre-defined library functions in C Programming
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