ATOF(3) Library Functions Manual ATOF(3)

atof
convert ASCII string to double

Standard C Library (libc, -lc)

#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”).
June 4, 1993 NetBSD 9.0