函数名: memicmp 
 功  能: 比较两个串s1和s2的前n个字节, 忽略大小写 
 用  法: #include <stdio.h> 
         int memicmp(void *s1, void *s2, unsigned n); 
 程序例: 
#include <stdio.h> 
 #include <string.h> 
int main(void) 
 { 
    char *buf1 = "ABCDE123"; 
    char *buf2 = "abcde456"; 
    int stat; 
    stat = memicmp(buf1, buf2, 5); 
    printf("The strings to position 5 are "); 
    if (stat) 
       printf("not "); 
    printf("the same\n"); 
    return 0; 
 }