类型转换问题

[hanyu]

#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <stdio.h>
int main()
{ struct tm *tm_ptr ,timestruct;
time_t the_time;
char buf[256];
char *result;
(void) time(&the_time);
tm_ptr = localtime(&the_time);
strftime(buf,256,"%A %d %B, %I: %S %P", tm_ptr);
printf("strftime gives: %s\n",buf);
strcpy(buf,"Mon 26 July 1999,17:53 will do fine");
printf("calling strptime with: %s\n",buf);
tm_ptr = &timestruct;
result = strptime(buf, "%a %d %b %Y, %R",tm_ptr);
printf("strptime consumed up to : %s\n",result);
printf("strptime gives:\n");
printf("date: %02d/%02d/%02d\n",tm_ptr->tm_year,tm_ptr->tm_mon+1,tm_ptr->tm_mday);
printf("time: %02d:%02d\n",tm_ptr->tm_hour,tm_ptr->tm_min);
exit(0);
} 这是书上的例子，编译的时候出现警告说整型转换成指针未经过类型转换strftime.c:18: warning: assignment makes pointer from integer without a cast 我找不到这个程序哪里涉及到类型转换了呀，请求帮忙