C++ newbie program error

i can' t understand the STUPID mistake! can anyone help?

Code:

---

#include <iostream>

main(){
    int x;
        cin >> x;
        cout << "My Second program in C++";
return 0;
}

---

program.cpp:5: error: ‘cin’ was not declared in this scope
program.cpp:6: error: ‘cout’ was not declared in this scope

Code:

---

#include <iostream>

int main()
{
    int x;
    std::cin >> x;
    std::cout << "My Second program in C++";
    return 0;
}

---

Fixed parts in red and indentation.

ok! thanks elysia...

Well,
the first "int" i think is not necessary although i add it!
Secondly i have a question about the other two...red marks. I have done one or two other programs correctly and i remember now that i put something like "namespace std" after main. But, i have no idea what does this mean...can you help me a bit?

thank you!! :)

your first integer is not neccesary here no, other than a little practice "declaring a variable"

Code:

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using namespace std;

---

see this thread

Quote:

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Originally Posted by brack

ok! thanks elysia...

Well,
the first "int" i think is not necessary although i add it!
Secondly i have a question about the other two...red marks. I have done one or two other programs correctly and i remember now that i put something like "namespace std" after main. But, i have no idea what does this mean...can you help me a bit?

thank you!! :)

---

If you mean the int before main, then it is absolutely necessary. The standard demands that every function has a return type and that main shall return int.

Quote:

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Originally Posted by Elysia

If you mean the int before main, then it is absolutely necessary. The standard demands that every function has a return type and that main shall return int.

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i think you are wrong cause even without "int" the porgram compiles and is running correctly...
also, the default return type of main is "int"...

HOWEVER i always write

Code:

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int main(void){
}

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:P
i just forget it in my previous program!

Quote:

---

Originally Posted by brack

i think you are wrong cause even without "int" the porgram compiles and is running correctly...

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Then you are using a non-standard compliant compiler. Time to switch.

Quote:

---

also, the default return type of main is "int"...

---

No, it does not. C++ requires that all functions have an explicit return type. There is no implicit main as in C90.

And i WAS so sure that i was right!! :( Nevermind, thanks "Elysia"!!!
So, in C++ programming you need to put "everything"...

Yes, you do. And thank goodness for that!

> i think you are wrong cause even without "int" the porgram compiles and is running correctly...
The first lesson to remember is that "my compiler does..." is no substitute for reading the standards.

EVERY compiler has idiosyncrasies which fall outside the strict interpretation of the standards. This is fine, so long as you know which rules you are breaking and why. But blindly accepting the "blessing" of your current compiler as being "the truth" will lead to trouble in the long run.

Correct !!! a programmer should never say: "My program is correct as the compiler shows no errors..."!

I know this salem, i just wanted to say another reason(which probably was not so right)...