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Header files allow a C source file to use functions in other C files or library files. The linker ignores the fact that these functions are not defined in C source code, assuming that they'll be defined somewhere else.

"stdlib" offers prototypes for many functions that deal with string conversion, pseudo-random number generation, dynamic memory management, program environment, integer math and other functions not available within the C standard.

See the related link below for a list of function prototypes offered by stdlib.h.

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