HP C/iX Library Reference Manual (30026-90004)

112 Chapter5

HP C/iX Library Function Descriptions

atof

Converts a string to a double ﬂoating-point number.

Syntax

#include <stdlib.h>

double atof (const char *

str

);

Parameters

str

A pointer to a character string to be converted to a double ﬂoating-point

number.

Return Values

x A double ﬂoating-point number.

Description

The atof function converts the string of characters that the

str

argument points to into a

double ﬂoating-point number. The atof function skips over white space before looking for

the start of the number. The format of the input string is the same as that accepted by the

%lf scanf format conversion.

This function converts any numeric and numeric formatting characters up to, but not after,

any non-numeric character that it encounters. In this case, atof() returns the number

that has been converted up to that point.