C语言文件包含实例

// names_st.h -- names_st structure header file
// constants
#include <string.h>
#define SLEN 32

// structure declarations
struct names_st
{
    char first[SLEN];
    char last[SLEN];
};

// typedefs
typedef struct names_st names;

// function prototypes
void get_names(names *);
void show_names(const names *);
char * s_gets(char * st, int n);

// names_st.c -- define names_st functions
#include <stdio.h>
#include "names_st.h"     // include the header file

// function definitions
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;
    char * find;

    ret_val = fgets(st, n, stdin);
    if (ret_val)
    {
        find = strchr(st, '\n');   // look for newline
        if (find)                  // if the address is not NULL,
            *find = '\0';          // place a null character there
        else
            while (getchar() != '\n')
                continue;          // dispose of rest of line
    }
    return ret_val;
}