01-31-2013
Thanks for the answers ...
yes, the minus sign (on sequence) needs to include on search like if was an similar letter A-Z ... its a fasta sequence aligned so its normal when protein/nucleotide sequence gets minus sign ...
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LEARN ABOUT REDHAT
strtod
STRTOD(3) Library functions STRTOD(3)
NAME
strtod, strtof, strtold - convert ASCII string to floating point number
SYNOPSIS
#include <stdlib.h>
double strtod(const char *nptr, char **endptr);
float strtof(const char *nptr, char **endptr);
long double strtold(const char *nptr, char **endptr);
DESCRIPTION
The strtod, strtof, and strtold functions convert the initial portion of the string pointed to by nptr to double, float, and long double
representation, respectively.
The expected form of the (initial portion of the) string is optional leading white space as recognized by isspace(3), an optional plus
(``+'') or minus sign (``-'') and then either (i) a decimal number, or (ii) a hexadecimal number, or (iii) an infinity, or (iv) a NAN (not-
a-number).
A decimal number consists of a nonempty sequence of decimal digits possibly containing a radix character (decimal point, locale dependent,
usually ``.''), optionally followed by a decimal exponent. A decimal exponent consists of an ``E'' or ``e'', followed by an optional plus
or minus sign, followed by a non-empty sequence of decimal digits, and indicates multiplication by a power of 10.
A hexadecimal number consists of a ``0x'' or ``0X'' followed by a nonempty sequence of hexadecimal digits possibly containing a radix char-
acter, optionally followed by a binary exponent. A binary exponent consists of a ``P'' or ``p'', followed by an optional plus or minus
sign, followed by a non-empty sequence of decimal digits, and indicates multiplication by a power of 2. At least one of radix character
and binary exponent must be present.
An infinity is either ``INF'' or ``INFINITY'', disregarding case.
A NAN is ``NAN'' (disregarding case) optionally followed by `(', a sequence of characters, followed by ')'. The character string specifies
in an implementation-dependent way the type of NAN.
RETURN VALUE
These functions return the converted value, if any.
If endptr is not NULL, a pointer to the character after the last character used in the conversion is stored in the location referenced by
endptr.
If no conversion is performed, zero is returned and the value of nptr is stored in the location referenced by endptr.
If the correct value would cause overflow, plus or minus HUGE_VAL (HUGE_VALF, HUGE_VALL) is returned (according to the sign of the value),
and ERANGE is stored in errno. If the correct value would cause underflow, zero is returned and ERANGE is stored in errno.
ERRORS
ERANGE Overflow or underflow occurred.
CONFORMING TO
ANSI C describes strtod, C99 describes the other two functions.
SEE ALSO
atof(3), atoi(3), atol(3), strtol(3), strtoul(3)
Linux 2001-06-07 STRTOD(3)