Need some help..

Alright, I'm creating a program that's for a pay roll for school. I'm supposed to allow the teacher to view the payroll information and to edit it from another menu. Well, I've created a program that works except it won't take decimals, which I'm told is because I'm using char instead of int or double but when I try and use double or int and get rid of the atoi, I get an error. Here is one section of the program.

Code:

/* Begin Matt B. Section */
int mattbview()
{
  char buffer[256];
  char buffer2[256];
  char buffer3[256];
  int ammount;
  ifstream mattb ("files/mattb.txt");				//Opens the file mattb.txt when mattb is called
  ifstream mattb2 ("files/mattb2.txt");				//Opens the file mattb2.txt when mattb2 is called
  ifstream mattb3 ("files/mattb3.txt");				//Opens the file mattb3.txt when mattb3 is called
  if (! mattb.is_open())							//The IF statement that displays "error opening file" when file cannot be found
  { 
	  cout << "Error opening file"; 
	  EXIT 
		Sleep(1000);		//Sleep 1 second
  }

  while (! mattb.eof() )							//Copies until the end of file (EOF)
  {
	system("CLS");
    mattb.getline (buffer,100);						//This stores the text of mattb.txt as buffer
	mattb2.getline (buffer2,100);					//This stores the text of mattb2.txt as buffer2
	mattb3.getline (buffer3,100);					//This stores the text of mattb3.txt as buffer3
	cout << endl << "\tName:  Matt Biltcliffe";
	cout << endl << "\tRate:  $10/hour";
	cout << endl << "\tMatt has worked "; 
    cout << buffer;
	cout << " hours.";
	cout << endl << "\tMatt has recieved a bonus of $";
	cout << buffer2;
	cout << " this week.";
	ammount = atoi(buffer) * 10 + atoi(buffer2) + atoi(buffer3);	//The math involved to figure out total money
	cout << endl << "\tThe total ammount of money owed to Matt is $";
	cout << ammount;
	cout << ".";
	cout << endl << endl << endl;
	Sleep(5000);		//Sleep 5 seconds
	
  }
  main();
  return 0;
}
int mattbenter() 
{
  char a[5];
  char b[5];
  char c[5];
  int d;
  ofstream mattb ("files/mattb.txt");				//opens mattb.txt for editing
  ofstream mattb2 ("files/mattb2.txt");				//opens mattb2.txt for editing
  ofstream mattb3 ("files/mattb3.txt");				//opens mattb3.txt for editing
    cout << endl << "\tName:  Matt Biltcliffe";
	cout << endl << "\tPay:  $10/hour";
	cout << endl << "\tPlease note that ONLY numbers are allowed.";
	cout << endl << endl << "\tPlease enter the ammount of hours worked (Standard pay):  ";
	cin >> a;
	cout << "\tPlease enter the amount of overtime worked (Time and a half):  ";
	cin >> c;
	cout << "\tPlease enter the bonus you'd like to give the employee:  ";
	cin >> b;
	cout << endl << "\tThank you, this is being entered into the database now and Matt's pay is being calculated.";
	cout << endl;
	d = atoi(c) * 15;
	Sleep(5000);		//Sleep 5 seconds
  if (mattb.is_open(), mattb2.is_open())
  {
    mattb << a;
    mattb2 << b;
    mattb3 << d;
	mattb.close();
	mattb2.close();
	mattb3.close();
	mattbview();
  }
  return 0;
}
/* End Matt B. Section */

I thought this was C but apparently in my path to figure out how to create the program, I passed into C++ territory. Oh well.... Any suggestions?

An annoying problem I'm sure. Fortunately, the fix is rather simple.
Every time you wrote atoi, change it to atof. atoi will change a string into an integer, atof will change a string into a float value

Be sure to assign the result to a double and not an int or you'll get warnings.

-Prelude

Thanx a lot. Yeah, deffinately annoying. I'll try it now