C++primer plus的一道题，为什么运行时老跳过cin.getline?

[qq_17791449]

设计一个名为car的结构，用它存储下述有关汽车的信息：生产商（存储在字符数组中的字符串）、生产年份（整数）。编写一个程序，向用户询问有多少辆汽车。随后，程序使用new来创建一个由相应数量的car结构组成的动态数组。接下来，程序提示用户输入每辆车的生产商（可能有多个单词组成）和年份的信息。请注意，这需要特别小心，因为它将交替读取数值和安符串。最后，程序将显示每个结构的内容。该程序运行情况如下(2,Hudson Hornet,1952,Kaiser,1951,是要用户输入的,最后2行是程序回显)：
How many cars do you wish to catalog? 2
Car #1:
Please enter the maker: Hudson Hornet
Please enter the year made: 1952
Car #2:
Please enter the maker: Kaiser
Please enter the year made: 1951
Here is your collection:
1952 Hudson Hornet
1951 Kaiser


代码如下：
#include <iostream>
using namespace std;
struct car
{
char producer[20];
int year;
};
int main()
{
int n,i;
cout<<"How many cars do you wish to catalog?";
cin>>n;
car* p=new car [n];
for(i=0;i<n;i++)
{
cout<<"Car #"<<i+1<<endl<<"Please enter the make:";
cin.getline(p[i].producer,20);
cout<<endl<<"Please enter the year made:";
cin>>(p+i)->year;
};
cout<<endl<<"Here is your collection:";
for(i=0;i<n;i++)
cout<<endl<<p[i].year<<" "<<(p+i)->producer;
delete [] p;
return 0;
}

用的VC++6.0，每次运行的时候cin.getline(p[i].producer,20);都没有起作用，直接跳过。改成cin>>的话就不会这样。请教各位大神，问题究竟出在哪儿了？？

[Cnwanglin]

cin.getline(char ch[],size)是cin 的一个成员函数，定义在<iostream>中，用于输入行指定size的字符串，以enter结束。若输入长度超出size，则不再接受后续的输入。

[Cnwanglin]

char c[10]; cin.getline( &c[0], 5); cout << c << endl; 注意 回车键也占用一个字符

[Cnwanglin]

basic_istream::getline Gets a line from the input stream. basic_istream<Elem, Tr>& getline( char_type *_Str, streamsize _Count ); basic_istream<Elem, Tr>& getline( char_type *_Str, streamsize _Count, char_type _Delim ); basic_istream<Elem, Tr>& getline( char_type *_Str, streamsize _Count ); basic_istream<Elem, Tr>& getline( char_type *_Str, streamsize _Count, char_type _Delim ); Parameters_Count The number of characters to read from strbuf. _Delim The character that should terminate the read if it is encountered before _Count. _Str A string in which to write. Return ValueThe stream ( *this). RemarksThe first of these unformatted input functions returns getline(_ Str, _Count, widen(' \n')). The second function extracts up to _Count - 1 elements and stores them in the array beginning at _ Str. It always stores the string termination character after any extracted elements it stores. In order of testing, extraction stops: At end of file. After the function extracts an element that compares equal to _Delim, in which case the element is neither put back nor appended to the controlled sequence. After the function extracts _Count - 1 elements. If the function extracts no elements or _Count - 1 elements, it calls setstate( failbit). In any case, it returns *this.

[赵4老师]

乍看起来c++的cin、cout在输入、输出上比c的scanf、printf简单，不用格式控制符！ 但是不用格式控制符，输入输出恰好是你期望的格式的时候好说；等到输入输出不是你期望的格式的时候，你就会觉得还是用格式控制符更方便、更靠谱。 摒弃cin、cout！ 使用scanf、printf。

[qq_17791449]

引用 2 楼 Cnwanglin 的回复:

char c[10]; cin.getline( &c[0], 5); cout << c << endl; 注意 回车键也占用一个字符

谢了！只需在for的开头加入cin.get()跳过回车就好了

[谁盗用了我的用户名]

前一个为什么不用cin.get();

[谁盗用了我的用户名]

cout << "Car #1:" << endl; cout << "Please enter the make: "; cin.getline(ps->manufacturer, 20); cout << "Please enter the made: "; cin >> (*ps).year; cout << "Car #2:" << endl; cout << "Please enter the make:"; cin.get(); cin.getline((ps+1)->manufacturer, 20); cout << "Please enter the made: "; cin >> (*(ps+1)).year;

[CPPWorld]

在循环体最后加一句cin.ignor(100,'\n');/*清除缓冲区里面的\n*/