第 14 章 结构和其他数据形式（names）

 *---------------------------------
     names1.c -- 使用指向结构的指针
 ---------------------------------*/
 
 #include <stdio.h>
 #include <string.h>
 
 #define NLEN 30
 
 struct namect
 {
     char fname[NLEN];
     char lname[NLEN];
     int letters;
 };
 
 void getinfo(struct namect *);
 void makeinfo(struct namect *);
 void showinfo(const struct namect *);
 char* s_gets(char *st, int n);
 
 int main()
 {
     struct namect person;
 
     getinfo(&person);
     makeinfo(&person);
     showinfo(&person);
 
     return ;
 }
 
 void getinfo(struct namect *pst)
 {
     printf("Please enter your first name.\n");
 
     s_gets(pst->fname, NLEN);
 
     printf("Please enter your last name.\n");
 
     s_gets(pst->lname, NLEN);
 }
 
 void makeinfo(struct namect *pst)
 {
     pst->letters = strlen(pst->fname) + strlen(pst->lname);
 }
 
 void showinfo(const struct namect *pst)
 {
     printf("%s %s, your name contains %d letters.\n"
         , pst->fname, pst->lname, pst->letters);
 }
 
 char* s_gets(char *st, int n)
 {
     char *ret_val;
     char *find;
 
     if (ret_val = fgets(st, n, stdin))
     {
         if (find = strchr(st, '\n'))            //查找换行符
             *find = '\0';
         else
             while (getchar() != '\n') continue;    //处理输入行的剩余字符
     }
 
     return ret_val;
 }

names1.c

 /*------------------------------
     names2.c -- 传递并返回结构
 ------------------------------*/
 
 #include <stdio.h>
 #include <string.h>
 
 #define NLEN 30
 
 struct namect
 {
     char fname[NLEN];
     char lname[NLEN];
     int letters;
 };
 
 struct namect getinfo(void);
 struct namect makeinfo(struct namect);
 void showinfo(struct namect);
 char* s_gets(char *st, int n);
 
 int main()
 {
     struct namect person;
 
     person = getinfo();
     person = makeinfo(person);
     showinfo(person);
 
     return ;
 }
 
 struct namect getinfo(void)
 {
     struct namect temp;
 
     printf("Please enter your first name.\n");
 
     s_gets(temp.fname, NLEN);
 
     printf("Please enter your last name.\n");
 
     s_gets(temp.lname, NLEN);
 
     return temp;
 }
 
 struct namect makeinfo(struct namect info)
 {
     info.letters = strlen(info.fname) + strlen(info.lname);
     return info;
 }
 
 void showinfo(struct namect info)
 {
     printf("%s %s, your name contains %d letters.\n"
         , info.fname, info.lname, info.letters);
 }
 
 char* s_gets(char *st, int n)
 {
     char *ret_val;
     char *find;
 
     if (ret_val = fgets(st, n, stdin))
     {
         if (find = strchr(st, '\n'))    //查找换行符，如果找到换行符，将换行符成空字符
             *find = '\0';
         else
             while (getchar() != '\n') continue;    //处理输入行的剩余部分
     }
 
     return ret_val;
 }

names2.c