Converts a string into a double. allegro game programming library.
#include <allegro.h>
double uatof(const char *s);
Convert as much of the string as possible to an equivalent double precision real number. This function is almost like `ustrtod(s, NULL)'.
Returns the equivalent value, or zero if the string does not represent a number.
uconvert(3alleg4), ustrtol(3alleg4), ustrtod(3alleg4)