Note that the pow function is how you do exponentiation in C--C does not have a built-in exponentiation operator (such as ** or ^ in some other languages).
Before calling these functions, remember to #include <math.h>. (It's always a good idea to #include the appropriate header(s) before using any library functions, but the math functions are particularly unlikely to work correctly if you forget.) Also, under Unix, you may have to explicitly request the math library by adding the -lm option at the end of the command line when compiling/linking.
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This page by Steve Summit // Copyright 1995, 1996 // mail feedback