我正在编写一个代码，从一个文本文件中从电影的名称搜索关于任何电影的信息。 关于那部电影的信息只有几行，我得把它们印在屏幕上。 我试着读其他东西，但看不懂。 而且我不擅长do/while循环，我更喜欢使用For循环。 我尝试使用find（），但无法使其工作。 我在这里完全是个初学者。 并且IF/ELSE部分中的部分不工作。 我不知道怎样才能比较台词。 另外，除了基本的东西，我不知道很多，所以很可能我不会知道你告诉我的任何事情。
bool search() // The search option to search in the txt file
{
string choi;
bool mainFlag = false;
string line = "";
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
reSrch:
string name = "n";
int year = 0;
string star = "n";
string blunt;
string blunt2;
int blunt3;
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
cout << "\n Please enter the name of the Movie (or n to skip name) : ";
cin >> blunt;
if (blunt == "n")
blunt = "n";
else
name = blunt;
cout << "\n Please enter a name of any one star of the Movie (or n to skip name of star) : ";
cin >> blunt2;
if (blunt2 == "n")
blunt2 = "n";
else
star = blunt2;
cout << "\n Please enter the year of production of the Movie (or 0 to skip year) : ";
cin >> blunt3;
if (blunt3 == 0)
blunt3 = 0;
else
year = blunt3;
////////////////////////////////////////////////////////////////////////////////////////////
if (blunt == "n" && blunt2 == "n" && blunt3 == 0)
{
cout << "\n You have not entered any of the information to make a search. Would you\n like to try again? If not then you will be sent back to the main menu."
"\n\n Please enter yes or no : ";
cin >> choi;
if (choi == "YES" || choi == "Yes" || choi == "yes")
{
Sleep(1500);
system("CLS");
goto reSrch;
}
else
{
Sleep(1500);
system("CLS");
//mainFlag = true;
}
}
else
{
if (name != "n")
{
if (star != "n")
{
if (year != 0)
{
mov.open("movie.txt");
for (unsigned int curLine = 0; getline(mov, line); curLine++)
{
if (line.find(name, 0) != string::npos)//npos is used to tell = no matches found
{
cout << "found: " << search << "line: " << curLine << endl;
}
}
for (unsigned int curLine = 0; getline(mov, line); curLine++)
{
if (line.find(star, 0) != string::npos)
{
cout << "found: " << search << "line: " << curLine << endl;
}
}
for (unsigned int curLine = 0; getline(mov, line); curLine++)
{
if (line.find(year, 0) != string::npos)
{
cout << "found: " << search << "line: " << curLine << endl;
}
}
mov.close();
}
else
{
mov.open("movie.txt", ios::app);
for (unsigned int curLine = 0; getline(mov, line); curLine++)
{
if (line.find(name, 0) != string::npos)
{
cout << "found: " << search << "line: " << curLine << endl;
}
}
for (unsigned int curLine = 0; getline(mov, line); curLine++)
{
if (line.find(star, 0) != string::npos)
{
cout << "found: " << search << "line: " << curLine << endl;
}
}
mov.close();
}
}
else
{
if (year != 0)
{
mov.open("movie.txt", ios::app);
for (unsigned int curLine = 0; getline(mov, line); curLine++)
{
if (line.find(name, 0) != string::npos)
{
cout << "found: " << search << "line: " << curLine << endl;
}
}
for (unsigned int curLine = 0; getline(mov, line); curLine++)
{
if (line.find(year, 0) != string::npos)
{
cout << "found: " << search << "line: " << curLine << endl;
}
}
mov.close();
}
else
{
mov.open("movie.txt", ios::app);
for (unsigned int curLine = 0; getline(mov, line); curLine++)
{
if (line.find(name, 0) != string::npos)
{
cout << "found: " << search << "line: " << curLine << endl;
}
}
mov.close();
}
}
}
else
{
if (star != "n")
{
if (year != 0)
{
mov.open("movie.txt", ios::app);
for (unsigned int curLine = 0; getline(mov, line); curLine++)
{
if (line.find(star, 0) != string::npos)
{
cout << "found: " << search << "line: " << curLine << endl;
}
}
for (unsigned int curLine = 0; getline(mov, line); curLine++)
{
if (line.find(year, 0) != string::npos)
{
cout << "found: " << search << "line: " << curLine << endl;
}
}
mov.close();
}
else
{
mov.open("movie.txt", ios::app);
for (unsigned int curLine = 0; getline(mov, line); curLine++)
{
if (line.find(star, 0) != string::npos)
{
cout << "found: " << search << "line: " << curLine << endl;
}
}
mov.close();
}
}
else
{
if (year != 0)
{
mov.open("movie.txt", ios::app);
for (unsigned int curLine = 0; getline(mov, line); curLine++)
{
if (line.find(year, 0) != string::npos)
{
cout << "found: " << search << "line: " << curLine << endl;
}
}
mov.close();
}
}
}
}
return mainFlag;
}
你的逻辑错了。 您的代码假设您可以针对每种不同的情况多次读取文件，但事实并非如此。 您必须读取文件一次，然后在读取时对每一行应用适当的逻辑。
加上year是一个整数，您不能使用find()查找整数，您需要首先将整数转换为字符串，我使用to_string函数来实现这一点。
像这样的东西
string year_string = to_string(year);
for (unsigned int curLine = 0; getline(mov, line); curLine++)
{
bool name_ok = name == "n" || line.find(name) != string::npos;
bool star_ok = star == "n" || line.find(star) != string::npos;
bool year_ok = year == 0 || line.find(year_string) != string::npos;
if (name_ok && star_ok && year_ok)
{
cout << "found: " << search << "line: " << curLine << endl;
}
}
_ok变量为true，如果在该类别中没有给出要搜索的内容，或者如果给出了要搜索的内容并且找到了它。 如果所有_ok变量都为true，那么我们就找到了要查找的内容。
这段代码也是你曾经代码长度的1/10左右，这也是一件好事。