linux gcc

hi someone knows why my gcc whe i compile my program usin iostream.h it gives me a lot of errors about the iostream header ......

It depends on the errors, but maybe it should be <iostream> without the '.h':

http://www.cplusplus.com/doc/ansi/hfiles.html

Posting code and error messages would be a good idea...

here's the code:

Code:

---


#include <iostream>

using namespace std;

main(){
      int k;
      cout << k;
      return 0;
 }

---

and here's the gcc output:


/tmp/cccD88Yz.o: In function `main':
/tmp/cccD88Yz.o(.text+0x1e): undefined reference to `std::cout'
/tmp/cccD88Yz.o(.text+0x23): undefined reference to `std::basic_ostream<char, st
d::char_traits<char> >::operator<<(int)'
/tmp/cccD88Yz.o: In function `__static_initialization_and_destruction_0(int, int
)':
/tmp/cccD88Yz.o(.text+0x50): undefined reference to `std::ios_base::Init::Init[i
n-charge]()'
/tmp/cccD88Yz.o: In function `__tcf_0':
/tmp/cccD88Yz.o(.text+0x7f): undefined reference to `std::ios_base::Init::~Init
[in-charge]()'
/tmp/cccD88Yz.o(.eh_frame+0x11): undefined reference to `__gxx_personality_v0'
collect2: ld returned 1 exit status

Try
g++ prog.cpp

Not
gcc prog.cpp

That is, use the C++ compiler and not the C compiler to compile your code.

thanks that was useful........

Code:

---

#include <iostream>

using namespace std;

main(){
      int k;
      cin >> k;
      cout << k;
      return 0;
 }

---

and with linux use g++ prog.cc

or you can always use the emacs complier (which is harder to understand) but pico is easy and basic to use.

Code:

---


#include <iostream>

using namespace std;

int main() {  // need to be returnign something from main.
      int k = 0 ; // gota intialize  k to be something
      cout << k;
      return 0;
 }

---

Main things i see wrong are
A: You arn't returning something from main, and it must be an int.
B: k was allocated but not initialized. so what ever memory k points to, it has soem random crap from what ever was there before

Iamien :you're right something i forgot at time to post the code i didn't copy the initialization...

my code was basic and simplistic and it allowed for the user to enter in what value they wanted for K.. But if you are not allowing for a user to define their own value - then make sure that you have intialized the value first.

Code:

---


#include <ostream>

using namespace std;

int main() {  // need to be returning something from main.
      int k = 0 ; // got to intialize  k to be something
      cout << k; // output of k
      return 0; // program ended successfully
 }

---

If you are using just output statements - you can make your program smaller and faster by going with just an ostream instead of iosteam..

A lot of programs for PDA's and Pagers etc (small hand held devices) use istream and ostream depending on their use.

For a program as small as the one that we have hashed and rehased then it won't make the slightest difference. But make a large program and test it out.

Be sure to 'comment' (i.e // output of k) your work to death - it will help in the long run. It will make the program easy to read and understand and definately easier to transfer into larger projects.

Quote:

---

Originally posted by NIM
or you can always use the emacs complier (which is harder to understand) but pico is easy and basic to use.

---

I really hate to nit pick, but just to alieviate any potential confusion: To my knowledge, neither Emacs or pico are/have a compiler. They just use gcc/g++.

~arker

Quote:

---

Originally posted by Arker
I really hate to nit pick, but just to alieviate any potential confusion: To my knowledge, neither Emacs or pico are/have a compiler. They just use gcc/g++.

~arker

---

yes

emacs and pico are the programs that you write the code in.. and gcc/g++ are the compilers