The helloworld code. yes i'm a newbie.

hello there,

started to learn the lang yesterday.
trying to compile the helloworld code.

Code:

---

#include <iostream>

int main();


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

---

and i get the followed errors when compiling with minigw.

Code:

---

helloworld.cpp:5:1: error: expected unqqualified-id before '{' token

---

Code:

---

helloworld.cpp:5:1: error: 'cout' does not name a type
helloworld.cpp:6:2: error: expected unqualified-id before 'return'
helloworld.cpp:7:1: error: expecteed declartion before '}' token

---

i'm honestly losing my sanity in this stupid error.
please provide some direct answers why this is happening, because Google could not.

thanks !

Since you're initialising the main function, you shouldn't have a semicolon there. That tells the compiler that you're ending the function there (which would just be a declaration and that's not what you want) when you're actually trying to define it.

cout is a member of the std namespace, so you must include it by specifying:

Code:

---

using std::cout;

---

before the main initialisation.

Try this:

Code:

---

#include<iostream>
int main()
{
    std::cout<<"I can't RTFM.";
    std::cin.get();
    return 0;
}

---

You may want to study this link: C++ program structure. Look closely at semicolon placement and the scoping of the std::namespace.

Jim

Quote:

---

Originally Posted by manasij7479

Try this:

Code:

---

#include<iostream>
int main()
{
    std::cout<<"I can't RTFM.";
    std::cin.get();
    return 0;
}

---

---

this is what i get now

Code:

---

$ gcc helloworld.cpp
C:\Users\Johni\AppData\Local\Temp\ccWmztK5.o:helloworld.cpp:(.text+0x19): undefined reference to `std::cout'
C:\Users\Johni\AppData\Local\Temp\ccWmztK5.o:helloworld.cpp:(.text+0x1e): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
C:\Users\Johni\AppData\Local\Temp\ccWmztK5.o:helloworld.cpp:(.text+0x37): undefined reference to `std::ios_base::Init::~Init()'
C:\Users\Johni\AppData\Local\Temp\ccWmztK5.o:helloworld.cpp:(.text+0x5a): undefined reference to `std::ios_base::Init::Init()'collect2: ld returned 1 exit status

---

Post your current code. But did you properly scope the std namespace?

Jim

Quote:

---

Originally Posted by Jonathan Yaniv

$ gcc helloworld.cpp

---

Try "g++" instead of "gcc" as gcc is the C compiler frontend;

Quote:

---

Originally Posted by jimblumberg

Post your current code. But did you properly scope the std namespace?

Jim

---

doing so right now.

Code:

---

#include <iostream>

int main()


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

---

after adding the "using namespace std;" line before the "int main()" it is still bringing up some errors;

Code:

---

$ gcc helloworld.cppC:\Users\Johni\AppData\Local\Temp\ccGlc2e9.o:helloworld.cpp:(.text+0x19): undefined reference to `std::cout'
C:\Users\Johni\AppData\Local\Temp\ccGlc2e9.o:helloworld.cpp:(.text+0x1e): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
C:\Users\Johni\AppData\Local\Temp\ccGlc2e9.o:helloworld.cpp:(.text+0x37): undefined reference to `std::ios_base::Init::~Init()'
C:\Users\Johni\AppData\Local\Temp\ccGlc2e9.o:helloworld.cpp:(.text+0x5a): undefined reference to `std::ios_base::Init::Init()'collect2: ld returned 1 exit status

---

Quote:

---

Originally Posted by manasij7479

Try "g++" instead of "gcc" as gcc is the C compiler frontend;

---

worked !
i think i got the idea after reading that namespace thing though i did not understand fully what it is for.
that's the line i was missing all the way..

if the "cout" command is included in the iostream.h why didn't the compiler recognized it?

btw. now i get something else when running the .exe

Code:

---

The program can't start because libgcc_s_dw2-1.dll is missing from your computer. Try reinstalling the program to fix this problem.

---

Option 1: Copy the file "libgcc_s_dw2-1.dll" from the Compiler bin folder to where the exe file was created.
Option 2: Add the location of "libgcc_s_dw2-1.dll" to the computer system search path.
I forget the other options.

I prefer option 1; but, I have at least a dozen different compilers on my home PC.

Tim S.

Quote:

---

Originally Posted by stahta01

Option 1: Copy the file "libgcc_s_dw2-1.dll" from the Compiler bin folder to where the exe file was created.
Option 2: Add the location of "libgcc_s_dw2-1.dll" to the computer system search path.
I forget the other options.

I prefer option 1; but, I have at least a dozen different compilers on my home PC.

Tim S.

---

I actually searched for this and I found that adding -static to the g++ command fixes this.
Worked well !

Thank you so much guys being so helpful.
We will be in touch in other threads I believe.

Thanks again.

Quote:

---

Originally Posted by Jonathan Yaniv

I actually searched for this and I found that adding -static to the g++ command fixes this.
Worked well !

Thank you so much guys being so helpful.
We will be in touch in other threads I believe.

Thanks again.

---

FYI: Warning: This option might NOT be legal for commercial code. The library is likely LGPL and static linking would likely violent the license on Commercial code.

Tim S.