原型:extern int memcmp(void *buf1, void *buf2, unsigned int count);
用法:#include <string.h>
功能:比較內存區域buf1和buf2的前count個字節。
說明: 當buf1<buf2時,返回值<0 當buf1=buf2時,返回值=0 當buf1>buf2時,返回值>0
舉例: // memcmp.c
#include <syslib.h>
#include <string.h>
main() {
char *s1="Hello, Programmers!";
char *s2="Hello, programmers!";
int r;
clrscr();
r=memcmp(s1,s2,strlen(s1));
if(!r) printf("s1 and s2 are identical");
else if(r<0) printf("s1 less than s2");
else printf("s1 greater than s2");
getchar();
return 0;
}