What is a header file in C?
a) A file that contains function declarations and macros
b) A file that contains the main function
c) A file that is used for memory management
d) A file that is used to store global variables
Answer:
a) A file that contains function declarations and macros
Explanation:
A header file in C is a file with a .h extension that contains function declarations, macros, constants, and type definitions. These files are included in C programs using the #include directive, allowing for the reuse of code across multiple source files. Standard header files like stdio.h and stdlib.h provide declarations for functions like printf() and malloc().
Using header files promotes modularity and helps organize code by separating the implementation of functions and data structures from their declarations. This makes programs easier to understand, maintain, and extend.