Thread: output file

I am trying to work with outputting files from a program. I thought I knew the basics of how to output to an output file but I can't get it to work. I keep getting errors:

cpp(34) : error C2872: 'ostream' : ambiguous symbol
cpp(34) : error C2248: 'ostream:stream' : cannot access protected member declared in class 'ostream'
c:\program files\microsoft visual studio\vc98\include\ostream.h(99) : see declaration of 'ostream:stream'
cpp(35) : error C2039: 'open' : is not a member of 'ostream'
c:\program files\microsoft visual studio\vc98\include\ostream.h(59) : see declaration of 'ostream'
Error executing cl.exe.

.obj - 3 error(s), 0 warning(s)

any help is appreciated (This is only my 3rd C++ program so I am by no means an expert at this!)


//************************************************** **********
#include <ctype.h>
#include <fstream.h>
#include <ostream.h> //for file I/O
#include <iostream.h>
#include <iomanip>
using namespace std;


int main()
{
double num1;
double num2;
char math;
char AGAIN='Y';
ostream outData; // internal name to represent output file
outData.open("results.dat");


cout << "format is <number> <operation> <number>" << endl;
cout << "operations are +, -, *, /" << endl;
cin >> num1 >> math >> num2;


while ((AGAIN =='Y') || (AGAIN =='y'))
{

switch(math)
{
default:
cout << "Invalid operation." << endl;
cout << "Press any key to exit" <<endl;
break;

case '+':
cout << num1 + num2 << endl;
break;

case '-':
cout << num1 - num2 << endl;
cout << "Press any key to exit" <<endl;
break;

case '*':
cout << num1 * num2 << endl;
cout << "Press any key to exit" <<endl;
break;

case '/':
cout << num1 / num2 << endl;
cout << "Press any key to exit" <<endl;
if (num2 == 0)
{
cout << "Can't divide by ZERO!" <<endl;
}
break;







} //end of switch



cout << "Do you want to continue? Y/N" <<endl;
cin >> AGAIN;//value to continue or to exit the program


if ((AGAIN == 'Y') || (AGAIN == 'y'))

{
cout << "format is <number> <operation> <number>" << endl;
cout << "operations are +, -, *, /" << endl;
cin >> num1 >> math >> num2;
}//end of if

}//end of while

return 0;
}

>ostream outData
should be 'ofstream outData'

Thanks, I'll give it a try!

I just noticed something in passing...unless I'm missing something, you don't need to include ostream.h and iostream.h, explicitly. You only need fstream.h. Making that ostream an ofstream, like clownpimp said, should work also.

I tried what you and clownPimp said by changing ofstream outData and now I'm getting the following error.

cpp(34) : error C2872: 'ofstream' : ambiguous symbol
Error executing cl.exe.

fstream.h - ostream.h - istream.h

take a look at the structure of these and
notice how there all derived

so including both rather than just fstream is redundent