Zilog Z8F0130 - Manual (Page 494)

Appendix B. C Standard Library UM013037-1212
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Returns
A pointer to the located string or a null pointer if the string is not found.
Example
char *ptr;
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char s1[]="Production Languages";
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char s2[]="Lang";
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ptr=strstr(s1,s2);
strtod
Converts the string pointed to by nptr to double representation. The function recognizes
an optional leading sequence of white-space characters (as specified by the isspace
function), then an optional plus or minus sign, then a sequence of digits optionally con-
taining a decimal point, then an optional letter e or E followed by an optionally signed
integer, then an optional floating suffix. If an inappropriate character occurs before the
first digit following the e or E, the exponent is taken to be zero.
The first inappropriate character ends the conversion. If endptr is not a null pointer, a
pointer to that character is stored in the object endptr points to; if an inappropriate charac-
ter occurs before any digit, the value of nptr is stored.
The sequence of characters from the first digit or the decimal point (whichever occurs
first) to the character before the first inappropriate character is interpreted as a floating
constant according to the rules of this section, except that if neither an exponent part or a
decimal point appears, a decimal point is assumed to follow the last digit in the string. If a
minus sign appears immediately before the first digit, the value resulting from the conver-
sion is negated.
Synopsis
#include

double strtod(char *nptr, char **endptr);
Returns
The converted value, or zero if an inappropriate character occurs before any digit. If the
correct value would cause overflow, plus or minus HUGE_VAL is returned (according to
the sign of the value), and the macro
errno acquires the value ERANGE. If the correct
value causes underflow, zero is returned and the macro errno acquires the value
ERANGE.
Example
char *ptr;
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char s[]="0.1456";
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