#include <stdio.h>
#include <string.h>
char * s_gets(char * st, int n);
#define MAXTITL 40
#define MAXAUTL 40
#define MAXBKS 100 //最大书籍数
struct book { //建立book结构声明
char title[MAXTITL];
char author[MAXAUTL];
float value;
};
int main(void)
{
struct book library[MAXBKS]; //book 类型结构的数组
int count = 0;
int index;
printf("Please enter the book title.\n");
printf("Press [enter] at the start of a line to stop.\n");
while (count < MAXBKS && s_gets(library[count].title, MAXTITL) != NULL
&& library[count].title[0] != '\0')
//library[count].title[0] != '\0'判断字符串中的首字符是否为空字符
//按下 Enter 键相当于输入了一个字符串
{
printf("Now enter the author.\n");
s_gets(library[count].author, MAXAUTL);
printf("Now enter the value.\n");
scanf("%f", &library[count++].value);
while (getchar() != '\n')
continue; //清理输入行
if (count < MAXBKS)
printf("Enter the next title.\n");
}
if (count > 0)
{
printf("Here is the list of your books:\n");
for (index = 0; index < count; index++)
printf("%s by %s: $%.2f\n", library[index].title,
library[index].author, library[index].value);
}
else
printf("No books? Too bad.\n");
return 0;
}
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'); // 查找换行符
if (find) //如果地址不是NULL
*find = '\0'; // 在此处放置一个空字符
else
while (getchar() != '\n')
continue; // 处理输入行中剩余的字符
}
return ret_val;
}
-->
#include <stdio.h>
#include <string.h>
char * s_gets(char * st, int n);
#define MAXTITL 40
#define MAXAUTL 40
#define MAXBKS 100 //最大书籍数
struct book { ...