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Newb C++ Question

T

Transition

Banned
Ok newb to C++ here.. I downloaded Cygwin so i could use GCC as my compiler. Here's what i tried to compile..

#include <iostream.h>

int main()
{
cout << "WORK DAMNIT\n";

return 0;
}

Here's what Cygwin tells me...

cortex@void ~
$ gcc test.c
test.c:1:20: iostream: No such file or directory
test.c: In function `main':
test.c:5: `cout' undeclared (first use in this function)
test.c:5: (Each undeclared identifier is reported only once
test.c:5: for each function it appears in.)

What am i doing wrong? TIA
 
Originally posted by: Transition
Ok newb to C++ here.. I downloaded Cygwin so i could use GCC as my compiler. Here's what i tried to compile..

#include <iostream.h>

int main()
{
cout << "WORK DAMNIT\n";

return 0;
}

Here's what Cygwin tells me...

cortex@void ~
$ gcc test.c
test.c:1:20: iostream: No such file or directory
test.c: In function `main':
test.c:5: `cout' undeclared (first use in this function)
test.c:5: (Each undeclared identifier is reported only once
test.c:5: for each function it appears in.)

What am i doing wrong? TIA
Click to expand...

Sounds like it's not finding iostream.h.

Since that contains the declarations for cin, cout, etc. none of those will work.

Viper GTS
 
Originally posted by: Viper GTS
Originally posted by: Transition
Ok newb to C++ here.. I downloaded Cygwin so i could use GCC as my compiler. Here's what i tried to compile..

#include <iostream.h>
Click to expand...

close, but not quite. Either do it:

#include<iostream>

or

#include 'iostream.h'

BTW, can't find iostream was one of your errors.
Click to expand...
 
I removed the .h from iostream.h and still got this..

cortex@void ~
$ gcc test.C
test.C: In function `int main()':
test.C:5: `cout' undeclared (first use this function)
test.C:5: (Each undeclared identifier is reported only once for each function
it appears in.)
 
Originally posted by: Transition
I removed the .h from iostream.h and still got this..

cortex@void ~
$ gcc test.C
test.C: In function `int main()':
test.C:5: `cout' undeclared (first use this function)
test.C:5: (Each undeclared identifier is reported only once for each function
it appears in.)
Click to expand...

Ok, then what everyone else is saying is probably right.
 
Originally posted by: Transition
I removed the .h from iostream.h and still got this..

cortex@void ~
$ gcc test.C
test.C: In function `int main()':
test.C:5: `cout' undeclared (first use this function)
test.C:5: (Each undeclared identifier is reported only once for each function
it appears in.)
Click to expand...

Same basic problem, you're calling undeclared functions.

Viper GTS
 
Think of it this way: should you have iostream? Probably not. It generally is not installed. What OS are you running?

try this in a new file:

int main()
{

print ("some text");

}

That doesn't use iostream, so it shoud compile.
 
Better idea: search for iostream.h. When (if) you find it, include it in the file by doing this:

#include 'c:\full\path\to\iostream.h'

If that works, you'll have to figure out why your include folder isn't in your PATH.
 
Originally posted by: dejitaru
Think of it this way: should you have iostream? Probably not. It generally is not installed. What OS are you running?

try this in a new file:

int main()
{

print ("some text");

}

That doesn't use iostream, so it shoud compile.
Click to expand...

nope..

crap.C: In function `int main()':
crap.C:4: `print' undeclared (first use this function)
crap.C:4: (Each undeclared identifier is reported only once for each functio
it appears in.)

 
Originally posted by: dejitaru
Think of it this way: should you have iostream? Probably not. It generally is not installed. What OS are you running?

try this in a new file:

int main()
{

print ("some text");

}

That doesn't use iostream, so it shoud compile.
Click to expand...

It's printf, not print
 
I'm using cygwin right now. Am i supposed to be compiling this from a specific directory? And if so, how do i search in *nix for a file?
 
Originally posted by: Transition
I'm using cygwin right now. Am i supposed to be compiling this from a specific directory? And if so, how do i search in *nix for a file?
Click to expand...

I thought cygwin was win32...

In unix, try 'find / -name "iostream.h" '
 
Originally posted by: glugglug
try this:

#include <iostream>

using namespace std;

int main(int argc, char *argv[])
{
cout << "yada yada\n";
}
Click to expand...

Damn you! I always forget that part. And I'm in CompSci 3, which is really pathetic
 
The answer is rather simple:

The C++ compiler is g++, not gcc.

You can use gcc to compile C++ source, but you have to pass in a few command-line args that most people are not familiar with.
 
Originally posted by: manly
The answer is rather simple:

The C++ compiler is g++, not gcc.

You can use gcc to compile C++ source, but you have to pass in a few command-line args that most people are not familiar with.
Click to expand...

ah...interesting thought!
 
Originally posted by: gwlam12
what is using namespace std? i have never seen that in my life
Click to expand...

ANSI C++ allows you to defind namespaces beyond the standard (or std) namespace. Useful for overloading.

Technically, cout is std::cout for example. The using namespace std; line tells the compiler to use std::cout as opposed to some other namespace.
 
I rarely use gcc/g++ under Cygwin as I use VS(.NET), but... this works for me:

C:\dev\cpp>bash
bash-2.05a$ cat atotfoo.cpp
#include <iostream>

using namespace std;

int main(void)
{
cout << "foo" << endl;

return 0;
}bash-2.05a$ g++ atotfoo.cpp -o atotfoo.exe
bash-2.05a$ ./atotfoo.exe
foo
bash-2.05a$
 
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