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ATOF(3) Library Functions Manual ATOF(3)

atof
convert ASCII string to double

#include <stdlib.h>
double
atof(const char *nptr);

The atof() function converts the initial portion of the string pointed to by nptr to double representation.
It is equivalent to:
strtod(nptr, (char **)NULL);

atoi(3), atol(3), strtod(3), strtol(3), strtoul(3)

The atof() function conforms to ANSI X3.159-1989 (“ANSI C89”).

An atof() function first appeared in Version 1 AT&T UNIX.
September 10, 2015 OpenBSD-current