Why do you have to link the math library in C?

Question

If I include or in a C program I don\'t have to link these when compiling but I do have to link to

Answer 1

stdio is part of the standard C library which, by default, gcc will link against.

The math function implementations are in a separate libm file that is not linked to by default so you have to specify it -lm. By the way, there is no relation between those header files and library files.