#include<stdio.h>
#include<string.h>
int search(char*p[],char*name);
char*names[]={
    "help",
     "rex",
     "dennis",
     "john",
     "NULL"};
     void main()
    {
        if(search(names,"help")!=-1)
            printf("help is list.\n");
        if(search(names,"zhou")==-1)
            printf("zhou is not found.\n");
    }
    int search(char*p[],char*name)
    {
        register int t;
        for(t==0;p[t];++t)
            if(!strcmp(p[t],name))
                return t;
            return -1;
    }

for(t==0;p[t];++t) //t=0;
  if(!strcmp(p[t],name))
        return t;

char * names[]={"help", ..., NULL};    // 根据楼主的代码，需要在数组最后添加一个 NULL 来标示数组结束
for(t == 0; p[t]; ++t)                 // t == 0 明显应该是 t = 0

恩恩，太不小心了，谢谢啊！