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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.

On systems other than OpenBSD, the LC_NUMERIC locale(1) category can cause parsing failures; see CAVEATS in setlocale(3) for details.
January 16, 2019 OpenBSD-current