reading and writing to a file

Hey,

I have a file containing the number 1. I want to make a program that reads the number in the file, and then replaces the number incremented by 1.

so far I have this, but it does not seem to work, the file remains unchanged

Code:

---

int number;
fstream file;

  file.open("number.txt");
  file >> number;
  file.close();
  file.open("number.txt", ios::trunc);
  file << number+1;
  file.close();

---

file:

Code:

---

1

---

Cheers

Break it down, there's not much there. To start, try testing if the file is truly open (via the is_open member function perhaps) after you attempt to open them... don't just assume that the file is open, add some debug output statements that says "yes it's open" or "no, it's not open". Next, try printing the value of number after reading it in. If that is successful, then the problem is with writing the new incremented value to the file. If it's not successful, then the read didn't work and you should work on that part.