Incorrect data input with fstream

I tried to read in data from a text file using fstream but got wrong data.

ifstream fin ("C:\\Users\\rEgonicS\\Documents\\test.in");
int number;
fin >> number;
cout << number;

开发者_运维问答test.in is simply 12.

cout reads 4273190.

Can someone explain why this is so and how to fix it?

The most likely cause is that the file open failed. Check the status after opening, and also after reading; for a simple test, do something like this:

ifstream fin ("C:\\Users\\rEgonicS\\Documents\\test.in");
if (!fin) cout << "File open failed\n";
int number;
fin >> number;
if (!fin) cout << "File read failed\n";
cout << number;

This might give a further clue as to what's going on.