/*--------------------------------------
    names_st.h -- names_st 结构的头文件
--------------------------------------*/
#ifndef NAMES_ST_H
#define NAMES_ST_H

#include <string.h>

#define SLEN 32

//结构声明
struct names_st
{
    char first[SLEN];
    char last[SLEN];
};

//类型定义
typedef struct names_st names;

//函数原型
void get_names(names*);
void show_names(const names*);
char* s_gets(char *st, int n);

#endif

/*-----------------------------------------
    names_st.c -- 定义 names_st.h 中的函数
-----------------------------------------*/

#include <stdio.h>
#include "names_st.h"    //包含头文件

//函数定义
void get_names(names *pn)
{
    printf("Please enter your first name: ");
    s_gets(pn->first, SLEN);

    printf("Please enter your last name: ");
    s_gets(pn->last, SLEN);
}

void show_names(const names *pn)
{
    printf("%s %s", pn->first, pn->last);
}

char* s_gets(char *st, int n)
{
    char *ret_val, *find;

    if (ret_val = fgets(st, n, stdin))
    {
        if (find = strchr(st, '\n'))
            *find = '\0';
        else
            while (fgetc(stdin) != '\n') continue;    //处理输入行中的剩余字符
    }

    return ret_val;
}

/*----------------------------------------
    useheader.c -- 使用 names_st 结构
----------------------------------------*/

#include <stdio.h>
#include "names_st.h"
#include "names_st.h"    //第2次包含头文件

int main()
{
    names candidate;

    get_names(&candidate);
    printf("Let's welcome ");
    show_names(&candidate);
    printf(" to this program!\n");

    return 0;
}