[英]Fstream reading from file and looping C++
您好,我有一个关于使用fstream
循环和读取文件的问题。 我有这段代码,问题是我无法使其循环。
int studentSize, mark1,mark2,mark3;
string programme, course1, course2, course3;
filein >> studentSize;
filein >> programme;
filein.ignore();
while(getline(filein, name, '\n') &&
filein >> id &&
filein >> ws &&
getline(filein, course1, '\n') &&
filein >> mark1 &&
filein >> ws &&
getline(filein, course2, '\n') &&
filein >> mark2 &&
filein >> ws &&
getline(filein, course3, '\n') &&
filein >> mark3 &&
filein >> ws)
{
if( programme == "Physics" )
{
for(int i=0; i < studentSize; i++)
{
phys.push_back(new physics());
phys[i]->setNameId(name, id);
phys[i]->addCourse(course1, mark1);
phys[i]->addCourse(course2, mark2);
phys[i]->addCourse(course3, mark3);
sRecord[id] = phys[i];
}
}
}
我试图在代码之前添加一个while循环。 并执行以下操作:
filein >> studentSize;
filein >> programme;
filein >> repeat;
filein.ignore();
while(repeat == '&')
{ //above code }
并使我的文件像这样,以便在fstream >>
检测到&
字符时循环播放&
但它不起作用。 我不知道为什么。
2
Mathematics
&
Ashley
7961000
Doto
99
C++
99
Meh
99
&
Dwayne
7961222
Quantum
99
heh*
99
Computing
99
使用ignore()
是消耗&
的不良方法。 这是示例输入的有效解析:
int studentSize, id, mark1,mark2,mark3;
string name, programme, course1, course2, course3;
char delim;
cin >> studentSize >> programme >> delim;
cout << studentSize << ", " << programme << ", " << delim << endl;
while(cin >> name >> id >> course1 >> mark1 >> course2 >> mark2 >> course3 >> mark3)
{
//do more stuff with your variables here
cout << name << ", " << id << ", " << mark1 << ", " << course1 << ", " << mark2 << ", " << course2 << ", " << mark3 << ", " << course3 << < endl;
cin >> ws >> delim; //consume the &
}
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