CrossWorks for ARM User Guide

Portabilitysrand conforms to ISO/IEC 9899:1990 (C90) and ISO/IEC 9899:1999 (C99).See Also rand (page 301) RAND_MAX (page 302)strtolSynopsisDescriptionPortability#include double strtod(const char *nptr, char **endptr);strtod converts the initial portion of the string pointed to by nptr to a doublerepresentation.First, strtod decomposes the input string into three parts: an initial, possibly empty,sequence of white-space characters (as specified by isspace (page 246)), a subjectsequence resembling a floating-point constant, and a final string of one or moreunrecognized characters, including the terminating null character of the input string.strtod then attempts to convert the subject sequence to a floating-point number, andreturn the result.The subject sequence is defined as the longest initial subsequence of the input string,starting with the first non-white-space character, that is of the expected form. Thesubject sequence contains no characters if the input string is empty or consists entirelyof white space, or if the first non-white-space character is other than a sign or apermissible letter or digit.The expected form of the subject sequence is an optional plus or minus sign followedby a nonempty sequence of decimal digits optionally containing a decimal-pointcharacter, then an optional exponent part.If the subject sequence begins with a minus sign, the value resulting from theconversion is negated.A pointer to the final string is stored in the object pointed to by endptr, provided thatendptr is not a null pointer.If the subject sequence is empty or does not have the expected form, no conversion isperformed, the value of nptr is stored in the object pointed to by endptr, provided thatendptr is not a null pointer.strtod returns the converted value, if any. If no conversion could be performed, zero isreturned. If the correct value is outside the range of representable values, HUGE_VALis returned according to the sign of the value, if any, and the value of the macro errno(page 247) is stored in errno (page 247).strtod conforms to ISO/IEC 9899:1990 (C90).Chapter 28 - General utilities303