trying to compile a program in C++ gives me a bunch of errors ( Total N00b)

Ryupower · 06-12-2007, 10:22 PM

hey, I am brand new to c++ and trying to learn it and have it work on Linux.
I tried to compile a basic program via command line ( copied it from a book ) :

#include <cstdio>
#include <cstdlib>
#include <iostream>
using namespace std;

int main(int nNumberofArgs, char* pszArgs[])
{ //enter celsius
int celsius;
cout << "enter the Celsius here:";
cin >> celsius;

//Calculate conversion factor
int factor;
factor = 212 - 32;
//use conversion factor
int fahrenheit;
fahrenheit = factor * celsius / 200 + 32;
//output it all
cout << "in °F:";
cout << fahrenheit << endl ;
//wait for termination
system ("PAUSE");
return 0; #include <cstdio>
#include <cstdlib>
#include <iostream>
using namespace std;

int main(int nNumberofArgs, char* pszArgs[])
{ //enter celsius
int celsius;
cout << "enter the Celsius here:";
cin >> celsius;

//Calculate conversion factor
int factor;
factor = 212 - 32;
//use conversion factor
int fahrenheit;
fahrenheit = factor
}

so I try to compile it, but I get:

ME@UBUNTU:~/Desktop$ gcc -o degrees celcius.cpp
celcius.cpp:23: error: stray ‘#’ in program
celcius.cpp: In function ‘int main(int, char**)’:
celcius.cpp:23: error: ‘include’ was not declared in this scope
celcius.cpp:23: error: ‘cstdio’ was not declared in this scope
celcius.cpp:26: error: expected primary-expression before ‘using’
celcius.cpp:26: error: expected `;' before ‘using’
celcius.cpp:29: error: a function-definition is not allowed here before ‘{’ token
celcius.cpp:40: error: expected `}' at end of input

Why is it doing this and what am I doing wrong?

another question: Are there differences between scripting c++ programs on Windows and scripting on Linux? because oftentimes some programs I want to write won't compile on Linux...I get a bunch of errors, but they compile on the windows IDE I use.

jschiwal · 06-12-2007, 10:39 PM

Your program has two main functions. You seemed to have cat'ed two programs into one.

Also, it would be easier for others looking at your code if you enclosed it in code blocks and added line numbers.
E.G. "cat -n celcius.cpp"

Code:

     1  #include <cstdio>
     2  #include <cstdlib>
     3  #include <iostream>
     4  using namespace std;
     5
     6  int main(int nNumberofArgs, char* pszArgs[])
     7  { //enter celsius
     8  int celsius;
     9  cout << "enter the Celsius here:";
    10  cin >> celsius;
    11
    12  //Calculate conversion factor
    13  int factor;
    14  factor = 212 - 32;
    15  //use conversion factor
    16  int fahrenheit;
    17  fahrenheit = factor * celsius / 200 + 32;
    18  //output it all
    19  cout << "in °F:";
    20  cout << fahrenheit << endl ;
    21  //wait for termination
    22  system ("PAUSE");
    23  return 0;
    24  }

Ryupower · 06-13-2007, 01:30 PM

ah I see, lol.

Very stupid question. XD
Sorry about that.

I fixed that, made sure I only had one program:

Code:

1. #include <cstdio>
2. #include <cstdlib>
3. #include <iostream>
4 using namespace std;
5. int main(int nNumberofArgs, char* pszArgs[])
6. { //enter celsius 
7. int celsius;
8. cout << "enter the Celsius here:";
9. cin >> celsius;
10. //Calculate conversion factor
11. int factor;
12. factor = 212 - 32;
13. //use conversion factor
14. int fahrenheit;
15. fahrenheit = factor * celsius / 200 + 32;
16.//output it all
17. cout << "in °F:";
18. cout << fahrenheit << endl ;
19. //wait for termination
20. system ("PAUSE");
21. return 0;
22. }

and I get:

Code:

/Desktop$ gcc -o degrees celcius.cpp /tmp/cc4NALEN.o: In function `__static_initialization_and_destruction_0(int, int)': celcius.cpp:(.text+0x23): undefined reference to `std::ios_base::Init::Init()' /tmp/cc4NALEN.o: In function `__tcf_0': celcius.cpp:(.text+0x6c): undefined reference to `std::ios_base::Init::~Init()' /tmp/cc4NALEN.o: In function `main': celcius.cpp:(.text+0x8e): undefined reference to `std::cout' celcius.cpp:(.text+0x93): 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*)' celcius.cpp:(.text+0xa1): undefined reference to `std::cin' celcius.cpp:(.text+0xa6): undefined reference to `std::basic_istream<char, std::char_traits<char> >::operator>>(int&)' celcius.cpp:(.text+0xe5): undefined reference to `std::cout' celcius.cpp:(.text+0xea): 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*)' celcius.cpp:(.text+0xf8): undefined reference to `std::cout' celcius.cpp:(.text+0xfd): undefined reference to `std::basic_ostream<char, std::char_traits<char> >::operator<<(int)' celcius.cpp:(.text+0x105): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::endl<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)' celcius.cpp:(.text+0x10d): undefined reference to `std::basic_ostream<char, std::char_traits<char> >::operator<<(std::basic_ostream<char, std::char_traits<char> >& (*)(std::basic_ostream<char, std::char_traits<char> >&))' /tmp/cc4NALEN.o:(.eh_frame+0x11): undefined reference to `__gxx_personality_v0' collect2: ld returned 1 exit status

I must be doing something wrong... AGAIN...

And are there differences in c++ between linux and windows?

thanks guys for having patience with me.

Millenniumman · 06-13-2007, 03:44 PM

You need to compile it with g++

Ryupower · 06-13-2007, 06:09 PM

like this?

~/Desktop$ g++ celcius.cpp
celcius.cpp:1: error: stray ‘#’ in program
celcius.cpp:2: error: stray ‘#’ in program
celcius.cpp:3: error: stray ‘#’ in program
celcius.cpp:7:1: error: invalid suffix "int" on floating constant
celcius.cpp:1: error: expected unqualified-id before numeric constant
celcius.cpp:5: error: expected unqualified-id before numeric constant

nadroj · 06-13-2007, 10:09 PM

try:

Code:

g++ celcius.cpp -o celcius

then run './celcius' from the directory you compiled it in.

Israfel2000 · 06-15-2007, 12:46 PM

If you are going to compile a C program use gcc. But if you're going compile a C++ program then you can use g++. It will give you errors if you're going to compile a C program using g++ or vice versa. :/

Dark_Helmet · 06-15-2007, 02:57 PM

Quote:

Originally Posted by Ryupower

like this?

~/Desktop$ g++ celcius.cpp
celcius.cpp:1: error: stray ‘#’ in program
celcius.cpp:2: error: stray ‘#’ in program
celcius.cpp:3: error: stray ‘#’ in program
celcius.cpp:7:1: error: invalid suffix "int" on floating constant
celcius.cpp:1: error: expected unqualified-id before numeric constant
celcius.cpp:5: error: expected unqualified-id before numeric constant

Ok, I'm guessing you're learning C++ coming from a BASIC background. Is that right? The reason I ask is because the errors you report suggest your source code actually contains the line numbers at the beginning of each line. In other words, you're trying to compile exactly what you posted previously. As I recall, the BASIC I learned used line numbers. In C/C++ don't use them. The code you should be compiling is the following (with spacing in the way I prefer it):

Code:

#include <cstdio>
#include <cstdlib>
#include <iostream>

using namespace std;

int main(int nNumberofArgs, char* pszArgs[])
{
  //enter celsius 
  int celsius;

  cout << "enter the Celsius here:";
  cin >> celsius;

  //Calculate conversion factor
  int factor;
  factor = 212 - 32;

  //use conversion factor
  int fahrenheit;
  fahrenheit = factor * celsius / 200 + 32;

  //output it all
  cout << "in °F:";
  cout << fahrenheit << endl ;

  //wait for termination
  system ("PAUSE");

  return 0;
}

Compile it with the command nadroj gave you:

Code:

g++ celcius.cpp -o celcius

jschiwal · 06-16-2007, 06:41 PM

My suggestion was to add line numbers when posting questions about the code. Then you can refer to lines by their linenumber. An editor like kate and vim can display line numbers without them being part of the file.

Ryupower · 06-16-2007, 07:36 PM

Quote:

Originally Posted by nadroj

try:

Code:

g++ celcius.cpp -o celcius

then run './celcius' from the directory you compiled it in.

:O
It worked! Without error it compiled! The program calculated wrong...but that's an error on my part.
Thanks. ^^

Thanks to the rest too.

Dark_Helmet · 06-21-2007, 11:22 AM

I know this thread has been taken care of. I just wanted to respond really quick...

Quote:

Originally Posted by jschiwal

My suggestion was to add line numbers when posting questions about the code. Then you can refer to lines by their linenumber. An editor like kate and vim can display line numbers without them being part of the file.

I honestly don't remember if I saw that suggestion in my original reading. I got thrown off looking at the error messages being reported. Specifically:

Quote:

celcius.cpp:7:1: error: invalid suffix "int" on floating constant

That error suggested to me that the line numbers, including the period, were in the file as well. The line numbers, with a trailing period, would be a floating point constant, and would also explain the "stray `#'" errors.

My apologies for not reading things as closely as I should have.