How can I compile a simple C++ program. I have the following code in a file "rand.cpp" and would like to compile it from the command line.

#include <stdlib.h>
#include <iostream.h>
#include <math.h>
#include <time.h>

void main()
{
int i;
srand( (unsigned)time(NULL) );

for( i=0; i<10; ++i )
cout << rand() << endl;

for( i=0; i<10; ++i )
cout << (double) rand()/RAND_MAX << endl;

}


When I issue the command:
>cc rand.cpp

I get the following error.

/usr/bin/ld: Undefined symbols:
___ls__7ostreamPFRB0_RB0
___ls__7ostreamd
___ls__7ostreami
_cout
_endl__FR7ostream


What am I doing wrong? I have had better luck compiling simple c programs. Is there something special I have to do to compile a C++ program from the command line.

Thanks for any help.

[Mniot]

You're missing the libraries that implement the iostream functions. Use
cc rand.cpp -lstdc++
to compile and link with /usr/lib/libstdc++

Thanks, that did the trick. I also found that I could compile my program by using the following command line.

>c++ rand.cpp

I found the c++ binary within the /usr/bin directory. I'm not sure what this command is supposed to do (no man page), but it compiled my simple program above without any complaints. I think I'll stick to your suggestion, it just seems like invoking cc with the right flags is the more appropriate thing to do.

[LordJavac]

c++ basically just invokes cc with the appropriate flags for C++ (libraries, etc). This is the preferred method for compiling C++ code from the command-line.