iostream.h error

[jimberger]

hello

i have wrote a basic program

#include <iostream.h>

int main()
{
cout << &quot;hello world\n&quot;;
return 0;
}

when i compile

gcc test.cpp -o test

i get the following error

test.cpp:1: iostream.h: No such file or directory

 

[Salem]

> #include <iostream.h>
This is regarded as being obsolete. New C++ uses include files without any .h

Another significant difference is the idea of namespaces.

Here are some examples.

#include <iostream>
using namespace std;
int main()
{
 cout << &quot;hello world\n&quot;;
 return 0;
}

#include <iostream>
using std::cout;
int main()
{
 cout << &quot;hello world\n&quot;;
 return 0;
}

#include <iostream>
int main()
{
 std::cout << &quot;hello world\n&quot;;
 return 0;
}

Which form you choose depends on your code. For small programs which just use the standard library, you can get away with the first one.

Larger programs which use many libraries (each with their own namespace) should perhaps be written in one of the alternative forms.

--

 

[Cagliostro]

try to use g++

Ion Filipski

 

[rdward]

Having the same problem. I cut and pasted the examples
and still got the same error:

newhello.c:1:20: iostream: No such file or directory

Thanks in advance
Ron

 

[Salem]

Did you use
[tt]g++ test.cpp[/tt]

gcc is the 'C' compiler, used to compile prog.c files
g++ is the 'C++' compiler, used to compile prog.cpp files

> newhello.c:1:20: iostream: No such file or directory
Because this is now a C program, which you should compile with gcc, and use #include <stdio.h> (not iostream) for standard input/output.

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