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Standard C Libraries
memchr (Continued)
printf("\n");
ptr = memchr(buf1, ch2, 50);
if (ptr != NULL)
{
res = ptr - buf1 + 1;
printf("%c found at position %d\n", ch2, res);
}
else
printf("%c not found\n", ch2);
}
Output:
buf1 : What time is it?
i found at position 7
y not found
memcmp
Description:
Include:
Prototype:
Compare the contents of two buffers.
<string.h>
int memcmp(const void * s1 , const void * s2 , size_t n );
Arguments:
s1
s2
n
first buffer
second buffer
number of characters to compare
Return Value:
Remarks:
Example:
? 2008 Microchip Technology Inc.
Returns a positive number if s1 is greater than s2 , zero if s1 is equal to
s2 , or a negative number if s1 is less than s2 .
This function compares the first n characters in s1 to the first n charac-
ters in s2 and returns a value indicating whether the buffers are less
than, equal to or greater than each other.
#include <string.h> /* memcmp */
#include <stdio.h> /* for printf */
int main(void)
{
char buf1[50] = "Where is the time?";
char buf2[50] = "Where did they go?";
char buf3[50] = "Why?";
int res;
printf("buf1 : %s\n", buf1);
printf("buf2 : %s\n", buf2);
printf("buf3 : %s\n\n", buf3);
res = memcmp(buf1, buf2, 6);
if (res < 0)
printf("buf1 comes before buf2\n");
else if (res == 0)
printf("6 characters of buf1 and buf2 "
"are equal\n");
else
printf("buf2 comes before buf1\n");
DS51456E-page 115
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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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