C: Math functions?
c, math, visual-studio-2010
Solution
`Round()` does not exist in `math.h` for the Windows libraries. Define:
static inline double round(double val)
{
return floor(val + 0.5);
}
UPDATE: in response to your comment, sqrt() is defined in `math.h`
Problem
What include statement do I need to access the math functions in this C code? ``` unsigned int fibonacci_closed(unsigned int n) { double term_number = (double) n; double golden_ratio = (1 + sqrt(5)) / 2; double numerator = pow(golden_ratio, term_number); return round(numerator/sqrt(5)); } ``` I tried `#include <math.h>` but that didn't seem to do it. I'm using Visual Studio 2010 (Windows 7). This is the error: ``` 1>ClCompile: 1> fibonacci_closed.c 1>c:\users\odp\documents\visual studio 2010\projects\fibonacci\fibonacci\fibonacci_closed.c(7): warning C4013: 'round' undefined; assuming extern returning int 1>fibonacci_closed.obj : error LNK2019: unresolved external symbol _round referenced in function _fibonacci_closed ```