June 4, 1993 ATOF 3

### NAME

atof - convert ASCII string to double

### LIBRARY

Standard C Library (libc, -lc)

### SYNOPSIS

```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'') .