Cannot compile C++ with gcc

Question

I need to compile code on my linux system. This is simple code and I don't know what's wrong:

I have this code and I can't compile it:

#include <iostream>
#include <string>
using namespace std;

int main()
{
    string char1, char2, char3, char4, char5, char6;
    cout<<"Hello this is your standard True and False quiz"<<endl;
    cout<<"Please enter 'T' or 'F'"<<endl;
    cout<<"No#1 George Washington invented the toilet?"<<endl;
    cin>>char1;
    if ( char1 != "T" || "F")
    {
        cout<<"You entered an incorrect character please reenter True of False"<<endl;
        cin>>char1;
    }
    if ( char1 != "T" || "F")
    {
        cout<<"You entered an incorrect character please reenter True of False"<<endl;
        cin>>char1;
    }
    if ( char1 == "T" )
    {
        cout<<"You entered the incorrect answer. The answer is False"<<endl;
    }
    cout<<"No#2 The Squareroot of 3136 is 56?"<<endl;      
    cin>>char2;
    if ( char2 != "T" || "F")
    {
        cout<<"You entered an incorrect character please reenter True of False"<<endl;
        cin>>char2;
    }
    if ( char2 != "T" || "F")
    {
        cout<<"You entered an incorrect character please reenter True of False"<<endl;
        cin>>char2;
    }
    if ( char2 == "F" )
    {
        cout<<"You entered the incorrect answer. The answer is True"<<endl;
    }
    cout<<"No#3 
    system("PAUSE");
    return 0;
} 

When I try to compile it:

gcc file.c

I get:

test.c:1: fatal error: iostream: No such file or directory
compilation terminated.

As far as I know, I have all the libraries needed, what am I doing wrong?

Answer 1

You are trying to compile C++ with a C compiler. Try g++ file.c instead.

Also, it's good practice to name your file file.cpp instead - naming it .c won't stop it compiling, but it will help tools like make. Also, it'll help others who come across your source code later (including yourself).

Edit: Your code has some other problems which aren't related to your question, but you'll run in to them as soon as you get it to compile:

1. Your ( char1 != "T" || "F") should be ( char1 != "T" && char1 != "F") (note the && instead of ||)
2. You're reading another character when you get bad input, but because your code has no loops, the program will exit before it does anything with the next character.
3. As David Schwartz points out, it's worth removing system("PAUSE")

These are pretty common mistakes for newbies to C (Welcome! I'd recommend starting with some tutorials or introductory books. Here is an excellent list of C books and tutorials).

If you run in to anything you can't solve on your own, feel free to open another question.

Answer 2

That is C++ code, not C, and must be compiled accordingly. (It also has numerous logical errors, but we can worry about that later.)

Answer 3

You have C++ code:

#include <iostream>
#include <string>
using namespace std;
/* ... */

But are trying to compile it as if it were C:

gcc file.c

C++ is not C and you shouldn't treat it as if it were.

Try renaming your file to file.cpp and use g++ instead of gcc:

g++ file.cpp