为什么我不能输入第二本书的书名？

Question

[当我编译该程序时，我无法输入book2.title名称，使用获取功能是错误的，为什么？请进一步解释.......................................

#include<stdio.h>
#include<string.h>
struct name{
char author[20];
char title[20];
float price;
};
int main()
{
    struct name book1,book2;
    printf("Enter 1st title name:");
    gets(book1.title);
    printf("Enter 1st Author name:");
    gets(book1.author);
    printf("Enter 1st Book price:");
    scanf("%f",&book1.price);
    printf("\nThe 1st Book Name is %s",book1.title);
    printf("\nThe 1st Book Author is %s",book1.author);
    printf("\nThe 1st Book Price is %f",book1.price);
    printf("\nEnter 2nd title name:");
    gets(book2.title);
    printf("Enter 2nd Author name:");
    gets(book2.author);
    printf("Enter 2nd Book price:");
    scanf("%f",&book2.price);

    printf("\nThe 2nd Book Name is %s",book2.title);
    printf("\nThe 2nd Book Author is %s",book2.author);
    printf("\nThe 2nd Book Price is %f",book2.title);
     return 0;


}

Answer 1

忽略代码中的错误，您要问的问题在于这两行：

scanf("%f",&book1.price);
...
gets(book2.title);

注意，当您在终端中输入book1的价格（例如12.3）时，随后请按Enter。因此，stdin缓冲区包含字符12.3\n。 scanf读取它可以解释为浮点数12.3的前几个字节，而保留了\n的缓冲区。现在，当您运行gets时，它将读取换行符，并且第二本书的标题为空白字符串“ \ 0”。
查看此网站：https://www.geeksforgeeks.org/problem-with-scanf-when-there-is-fgetsgetsscanf-after-it/