atof(3) Library Functions Manual atof(3)

atof - convert a string to a 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. The behavior is the same as

strtod(nptr, NULL);

except that atof() does not detect errors.

The converted value.

For an explanation of the terms used in this section, see attributes(7).

Interface Attribute Value
atof () Thread safety MT-Safe locale

C11, POSIX.1-2008.

POSIX.1-2001, C89, C99, SVr4, 4.3BSD.

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

2024-05-02 Linux man-pages 6.9.1