How do I use pow() & sqrt() on UNix?

How do I use pow() and sqrt() function in Ubuntu? I have inc开发者_运维百科luded the math.h header file but it still gives me an error.

Try adding -lm to your linker command. Most of the math functions live in libm which needs to be explicitly linked in.

Link to libm.so, adding -lm to the compiler command line parameters.