iostream missing?

[beej101]

i used to be able to use the iostream.h header but now i can't use it (i.e. cout unavailable etc) could i have unwittingly uninstalled certain package iostream belongs to? thanks...

i'm getting iostream.h no such file or directory error

[jerome bettis]

#include <iostream> // (no .h for c++ libs)
using namespace std;
int main() {
cout "asdfaf";
}

// or

#include <iostream>
int main() {
std::cout "adsfasdf";
}

[thumper]

jerome bettis you're missing your '<<'s


#include <iostream>
int main() {
std::cout << "Hello World\n";
}

[beej101]

im not using namespace... i want it to be a simple include as in:

#include <iostream.h>

int main(){

cout << "hello\n";

return 0;
}

at the term i type:
gcc -o mycprog mycprog.c
i get:
iostream.h missing file or directory (or something along this line)
could i have mucked up my libraries when i try to remove some package using synaptic? thanks!

[gord]

remove the .h from the include :)
#include <iostream>

[thumper]

Your problem is your desire not to use namespaces. The problem is that namespaces are part of standard C++.

If you really don't want to prefix things with std:: then put the following in your source file:

using namespace std;
It is considered bad form, but it will give you the desired result.

iostream.h is the old pre-standard header file (pre 1998 - so really quite old really).

[beej101]

hmm i do embrace new standards i'm just thinking even if i can use the new one (namespaces) if my system doesn't allow me to use the old one(header include etc) then there must be something wrong with my install.

[supirman]

g++ -o myprog myprog.c

You're apparently trying to mix c and c++. With the above, you'll get warning about the deprecated header, but it will still work.

[thumper]

My advice is to just use the new one. Don't start bad habits.

[zkissane]

hmm i do embrace new standards i'm just thinking even if i can use the new one (namespaces) if my system doesn't allow me to use the old one(header include etc) then there must be something wrong with my install.

That's what "deprecated" means: it could be removed at any time; you have been warned.

[hod139]

If you want to test if iostream is still installed, you can run


find /usr/include/ -name iostream

and if you get results, the file exists. For example, on my machine I get


~$ find /usr/include/ -name iostream
/usr/include/c++/4.0.2/iostream
/usr/include/c++/3.4/iostream
/usr/include/c++/3.3/iostream


As supirman said, I think the problem is that you are mixing c++ and c code. cout is part of c++, and as such you should name your files mycprog.cpp and using

g++ -o myprog myprog.cpp
and as others have stated, include it using the "correct" header
#include <iostream>

Finally, you must use the std namespace, so anywhere you want to use cout, you must say std::cout (I also avoid the using keyword).

Hope this helps.

[saul]

Yes, it helped hold139, thanks.

I had the same problem, so I installed "g++" package and the file "iostream" got installed. Once this done the commands for compiling a file that includes iostream are g++.../c++... but not gcc... (I think) :p. Bye.