> insert #include <cmath> or <math.h> depending on what > language your using
Also, for mathematical functions, you need to link in the math library when you compile: gcc [your flags] -lm myprog.c The -lm is fed to the link-loader (ld) at link time. I've never understood why this should be necessary; other libraries get linked in automatically as required. Is there something special about the math library that it needs to be mentioned explicitly? This is a common pitfall on Unix-like systems. David
