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   9 <title>section 7.8.6: Mathematical Functions</title>
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  15 <H2>section 7.8.6: Mathematical Functions</H2>
  16 page 168
  17 <p>Note that the <TT>pow</TT> function is how you do
  18 exponentiation in C--C does not have a built-in
  19 exponentiation operator
  20 (such as <TT>**</TT> or <TT>^</TT> in some other languages).
  21 </p><p>Before calling these functions,
  22 remember to <TT>#include &lt;math.h&gt;</TT>.
  23 (It's always a good idea to <TT>#include</TT> the appropriate
  24 header(s) before using any library functions,
  25 but the math functions are particularly unlikely to work
  26 correctly if you forget.)
  27 Also,
  28 under Unix,
  29 you may have to explicitly request the math library
  30 by adding the <TT>-lm</TT> option at the end of the command line
  31 when compiling/linking.
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