c - c中的程序意外终止

Question

我是 c 的初学者。今天我遇到了一个问题。根据本书，如果我们提供以下输入:

Enter names, prices and no. of pages of 3 books 

A  100.00  354 
C  256.50  682 
F  233.70  512 

输出如下

And this is what you entered 

A  100.000000  354 
C  256.500000  682 
F  233.700000  512 

在运行时突然终止。

代码如下:

#include<stdio.h>
#include <ctype.h>
main( ) 
{ 
    struct book 
    {   
    char  name ; 
    float  price ; 
    int  pages ; 
    } ; 
    struct book  b1, b2, b3 ; 

    printf ( "\nEnter names, prices & no. of pages of 3 books\n" ) ; 
    scanf ( "%c %f %d", &b1.name, &b1.price, &b1.pages ) ; 
    scanf ( "%c %f %d", &b2.name, &b2.price, &b2.pages ) ; 
    scanf ( "%c %f %d", &b3.name, &b3.price, &b3.pages ) ; 

    printf ( "\nAnd this is what you entered" ) ; 
    printf ( "\n%c %f %d", b1.name, b1.price, b1.pages ) ; 
    printf ( "\n%c %f %d", b2.name, b2.price, b2.pages ) ; 
    printf ( "\n%c %f %d", b3.name, b3.price, b3.pages ) ; 
} 

Answer 1

只需在 %c 之前放置空格，这样如果 \n 在缓冲区中，它就不会被读入。

所以这应该可行:

scanf(" %c %f %d", &b1.name, &b1.price, &b1.pages);
scanf(" %c %f %d", &b2.name, &b2.price, &b2.pages);
scanf(" %c %f %d", &b3.name, &b3.price, &b3.pages);
     //^ See the space here, if there is no space but still a '\n' in the buffer it get's read