code does not compile

i am using devc++
and my code is

Code:

#include<iostream>

using namespace std;

class complex
{
    private :
        int a;
        int b;
    public :
        complexnum()
        {
            a = 0;
            b = 0;
        }
        void input()
        {
            cin >> a >> b;
        }
        void display()
        {
            cout << a << " + " << b <<"i";
        }
        void add(complexnum x,complexnum y);
        void sub(complexnum x,complexnum y);
}    

//implementation

void complexnum :: add(complexnum x,complexnum y)
{
    a = x.a + y.a;
    b = x.b + y.b;
}
void complexnum :: sub(complexnum x,complexnum y)
{
    a = x.a - y.a;
    b = x.b - y.b;
}

//application

int main()
{
    complexnum c1,c2,c3;

    c1.input();
    c2.input();

    c3.add(c1,c2);
    c3.display();

    c3.sub(c1,c2);
    c3.display();
}

The errors encountered are.
Compiler: Default compiler
Executing gcc.exe...
gcc.exe "C:\C++_Programming\complex.c" -o
:1:19: iostream: No such file or directory
:3: error: parse error before "namespace"
:3: warning: data definition has no type or storage class
:5: error: parse error before "complex"
.........

why is it so?
please help......

#include<iostream>

thats your problem

yes i know...........
but it has to be there........
so what is it thats wrong it that..........
i am not getting it......
please help me understand........

Also name your class one thing. Now it is both complex and complexnum.

oh sorry.....
but the problem starts with the first line itself.....
how do i continue........knowing about others?
please help me with that error it gives to me on the first line :
"iostream : no such file or directory"

please help me .......so that i can proceed.........
being stuck here is getting me irritated.......
i can't get anywhere......

please help me.......

Code:

#include<iostream>

using namespace std;

class complex
{
    private :
        int a;
        int b;
    public :
        complexnum()
        {
            a = 0;
            b = 0;
        }
        void input()
        {
            cin >> a >> b;
        }
        void display()
        {
            cout << a << " + " << b <<"i";
        }
        void add(complexnum x,complexnum y);
        void sub(complexnum x,complexnum y);
} ;// you forgot ;

I personally would not implement this class methods the way you want, but...

Also try to reinstall dev and make sure you install it to the default directory (I think its something like C:\Dev-C++)

Code:

#include <iostream>

using namespace std;

class complexnum

all my question revolves around the first line ..............
please answer my question ...............
which is quite to the point........................

1....in the first line............
......the error reported is
......"IOSTREAM - NO SUCH FILE OR DIRECTORY......"

2....on the third line.............
......the error reported is
......"parse error before "namespace"

I need to know this before anything else...............
u need not tell me anything else before u answer my question .........
i am not asking u to implement it either.........

please i want the answer to MY question.....

Ok here is an answer: Your compiler is probably not set up correctly/not installed correctly. Uninstall and install again in default directory to see if that helps.

Now, please answer my question a few posts down

the header file might be:

Code:

#include <iostream.h>

just a thought...

Bad thought. <iostream.h> is deprecated. Shakti is probably right: something in the compiler config is messed up.

Thanks a lot ........

Shakti you were right........
i uninstalled Dev-C++ and then downloaded it again.....
reinstalled it.......
the program works fine.......

thanks to all those who helped......

Originally Posted by CornedBee

Bad thought. <iostream.h> is deprecated.

I thought <iostream.h> wasn't standard.

Originally Posted by jlou

I thought <iostream.h> wasn't standard.

That was in the old days. Now standard makes that issue very clear:

"27.3 - Standard iostream objects [lib.iostream.objects]
Header <iostream> synopsis

namespace std {
extern istream cin;
extern ostream cout;
extern ostream cerr;
extern ostream clog;

extern wistream wcin;
extern wostream wcout;
extern wostream wcerr;
extern wostream wclog;
}

-1- The header <iostream> declares objects that associate objects with the standard C streams provided for by the functions declared in <cstdio> (lib.c.files).

-2- Mixing operations on corresponding wide- and narrow-character streams follows the same semantics as mixing such operations on FILEs, as specified in Amendment 1 of the ISO C standard. The objects are constructed, and the associations are established at some time prior to or during first time an object of class basic_ios<charT,traits>::Init is constructed, and in any case before the body of main begins execution.*

[Footnote: If it is possible for them to do so, implementations are encouraged to initialize the objects earlier than required. --- end foonote]
The objects are not destroyed during program execution.*
[Footnote: Constructors and destructors for static objects can access these objects to read input from stdin or write output to stdout or stderr. --- end foonote]
"
Cheers!

Originally Posted by Micko

Originally Posted by jlou

I thought <iostream.h> wasn't standard.

That was in the old days. Now standard makes that issue very clear.

Thanks, but I think you missed my point.

<iostream.h> was not standard in the old days, but it is now?


I was pointing out that by saying that something is deprecated, you are saying it is standard, since deprecated generally means standard but no longer preferred. If I am not mistaken, <iostream.h> is not even mentioned in the standard, and so therefore it is completely non-standard.

Since many of us try to recommend standards conformant code, it is a stronger statement to say that <iostream.h> is non-standard than to say it is deprecated.