C FunctionsLesson 28Free preview

C Math Functions

This lesson is part of C · All levels

Summary

The C mathematics library is provided with a header math.h containing functions such as sqrt (square root), pow (rank), ceil and floor (up/down clearance), and the M_PI constant for the value of pi. To use a mathematical function, a program usually needs to be linked to a mathematics library when compilation, for example -lm in GCC. Absolute values are taken with fabs for double or abs for int. These functions save time because you don't need to write the logic yourself.

Key points

Header provides sqrt, pow, ceil, floor, fabs, and so on
Sqrt calculates the square root, pow(a, b) calculates a of the order b
Ceilings round up, floors round down
In the GCC it's often necessary to flag-lms when compiling programs with math.

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