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Standard C Libraries
strtol
Description:
Include:
Prototype:
Converts a partial string to a long integer.
<stdlib.h>
long strtol(const char * s , char ** endptr , int base );
Arguments:
s
endptr
base
string to be converted
pointer to the character at which the conversion stopped
number base to use in conversion
Return Value:
Remarks:
Example:
Returns the converted number if successful; otherwise, returns 0.
If base is zero, strtol attempts to determine the base automatically.
It can be octal, determined by a leading zero, hexadecimal, determined
by a leading 0x or 0X, or decimal in any other case. If base is specified
strtol converts a sequence of digits and letters a-z (case insensi-
tive), where a-z represents the numbers 10-36. Conversion stops when
an out of base number is encountered. endptr will point to the remain-
der of the string starting with the first unconverted character. If a range
error occurs, errno will be set.
#include <stdio.h> /* for printf */
#include <stdlib.h> /* for strtol */
int main(void)
{
char *end;
char a[] = "-12BGEE";
char b[] = "1234Number";
long x;
x = strtol(a, &end, 16);
printf("String = \"%s\" long = %ld\n", a, x );
printf("Stopped at: %s\n\n", end );
x = strtol(b, &end, 4);
printf("String = \"%s\" long = %ld\n", b, x );
printf("Stopped at: %s\n\n", end );
}
Output:
String = "-12BGEE"
Stopped at: GEE
long = -299
? 2008 Microchip Technology Inc.
String = "1234Number"
Stopped at: 4Number
long = 27
DS51456E-page 111
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相关PDF资料
SW006015
C COMPILER MPLAB C32
SW300003-EVAL
LIBRARY SOFT MODEM-EVAL ONLY
SW300010-EVAL
SPEECH RECOG LIBRARY-EVAL ONLY
SW300040-EVAL
LIBRARY NOISE SUPPR-EVAL ONLY
SW300060-EVAL
LIBRARY ACOUSTIC ECHO-EVAL ONLY
SW300070-EVAL
SOFTWARE LIBR ENC/DEC EVAL ONLY
SW500012
HI-TECH C PRO FOR PIC32
SY87701LHI-EVAL
BOARD EVAL SY87701 EXPERIMENT
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