fatal error: iostream.h no such file or directory

Question

Possible Duplicate:
No such file iostream.h when including

Even after naming the source file with .cpp extension. my compiler gives this error, both in command prompt and Codeblocks. How can I fix this issue?

#include <iostream.h>


int main(){

    cout<<"Hello World!\n";
    return 0;
}

score 69 · Accepted Answer · edited Oct 24 '12 at 13:30

69

That header doesn't exist in standard C++. It was part of some pre-1990s compilers, but it is certainly not part of C++.

Use #include <iostream> instead. And all the library classes are in the std:: namespace, for example std::cout.

Also, throw away any book or notes that mention the thing you said.

edited Oct 24 '12 at 13:30

Puppy

answered Oct 24 '12 at 13:14

Kerrek SB

1

1970's?. was Bjarne still in high-school back then ? – WhozCraig Oct 24 '12 at 13:16
11

@J99: I never exaggerate, not in the entire history of the universe. – Kerrek SB Oct 24 '12 at 13:16
1

I think the original streams library was invented by some Jerry Schwartz in the early or mid-80s. For some reason I have 1984 stuck in my head, but I am too lazy to get D&E down from the shelf where it rots and check this. – sbi Oct 24 '12 at 20:17

score 11 · Answer 2 · edited Oct 24 '12 at 21:06

11

Using standard C++ calling (note that you should use namespace std for cout or add using namespace std;)

#include <iostream>

int main()
{
    std::cout<<"Hello World!\n";
    return 0;
}

edited Oct 24 '12 at 21:06

paxdiablo

answered Oct 24 '12 at 13:14

il_guru

Minus the part about "using namespace std." You should almost never do that. – caps Feb 02 '16 at 21:00

score 9 · Answer 3 · answered Oct 24 '12 at 13:14

9

You should be using iostream without the .h.

Early implementations used the .h variants but the standard mandates the more modern style.

answered Oct 24 '12 at 13:14

paxdiablo

3 Answers3