ATOF(3) | Library Functions Manual | ATOF(3)

# NAME

`atof` — convert ASCII string to double

# SYNOPSIS

`#include <stdlib.h>`

double
`atof`(const char *nptr);

# DESCRIPTION

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);

# SEE ALSO

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

# STANDARDS

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

# HISTORY

An `atof`() function first appeared in Version 1 AT&T UNIX.

# CAVEATS

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

September 11, 2022 | Debian