Question

c++程序出现错误，为什么输入的每个信息的第一个字母总是不能保存在文件里面。。求助？？

#include<iostream>
using namespace std;
#include<fstream>
void main()
{
char PBookBarCode[20];
char PBookName[20];
char PFirstAuthorName[20];
char POtherAuthorName[20];
char PBookType[20];
char PBookPosition[20];
char PPublishUnit[20];
char PPublishTime[20];
char PPrice[20];
cout<<"teacher input book"<<endl;
ofstream BookFile("book.txt",ios::out|ios::app);
cout<<"Please enter Book information:"<<endl;
cout<<"Book Tiaoxingma:"<<endl;
cin.ignore();
cin.getline(PBookBarCode,20);
BookFile<<PBookBarCode<<endl;
cout<<"Book Name:"<<endl;
cin.ignore();
cin.getline(PBookName,20);
BookFile<<PBookName<<endl;
cout<<"First Author Name:"<<endl;
cin.ignore();
cin.getline(PFirstAuthorName,20);
BookFile<<PFirstAuthorName<<endl;
cout<<"OtherAuthorName:"<<endl;
cin.ignore();
cin.getline(POtherAuthorName,20);
BookFile<<POtherAuthorName<<endl;
cout<<"Book sort code:"<<endl;
cin.ignore();
cin.getline(PBookType,20);
BookFile<<PBookType<<endl;
cout<<"Book position:"<<endl;
cin.ignore();
cin.getline(PBookPosition,20);
BookFile<<PBookPosition<<endl;
cout<<"publish Unit:"<<endl;
cin.ignore();
cin.getline(PPublishUnit,20);
BookFile<<PPublishUnit<<endl;
cout<<"publish time:"<<endl;
cin.ignore();
cin.getline(PPublishTime,20);
BookFile<<PPublishTime<<endl;
cout<<"price:"<<endl;
cin.ignore();
cin.getline(PPrice,20);
BookFile<<PPrice<<endl;
cout<<"input success!!!\n";
BookFile.close();
}

Answer 1

ignore() 函数像read()一样读字符，但它并不将读入的字符存放到任何地方（丢弃）。它也像read()一样能实际读n个字符（而不是n-1个）。有ignore()读入的字符的个数默认为1，所以，不用参数调用ignore()就意味着“丢掉下一个字符”。ignore()也可以用一个结束符，在读入中遇到这个结束符时，也将它从输入流中删除，ignore的默认结束符是文件结束。
以上是别人的解答，应该是cin.ignore()丢弃了第一个字符