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Basic C++ code issues/compiling

  • b_heyer
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Post February 28th, 2004, 2:38 pm

Alright, first off I am just learning C++ from an eBook I found online. The problem is they are very vague on compiling things so I kind of "winged" it to check to see if my "exercise" code is correct.

Basically I have exer1.c:
Code: [ Select ]
char  LetterCode;
double SalePrice;
long  Quantity;

Lettercode = 'v';
SalePrice = 67.95;
Quantity  = 1000000;
  1. char  LetterCode;
  2. double SalePrice;
  3. long  Quantity;
  5. Lettercode = 'v';
  6. SalePrice = 67.95;
  7. Quantity  = 1000000;


I load up Konsole and type g++ exer1.c and I get these errors:
Quote:
exer1.c:5: ISO C++ forbids declaration of `Lettercode' with no type
exer1.c:6: ISO C++ forbids declaration of `SalePrice' with no type
exer1.c:6: conflicting types for `int SalePrice'
exer1.c:2: previous declaration as `double SalePrice'
exer1.c:6: warning: initialization to `int' from `double'
exer1.c:6: warning: argument to `int' from `double'
exer1.c:7: ISO C++ forbids declaration of `Quantity' with no type
exer1.c:7: conflicting types for `int Quantity'
exer1.c:3: previous declaration as `long int Quantity'
exer1.c:7:23: warning: no newline at end of file


So I try to debug the errors, by commenting out the first three lines and defining the variables with their assignment line like so:
Code: [ Select ]
//char  LetterCode;
//double SalePrice;
//long  Quantity;

char Lettercode = 'v';
double SalePrice = 67.95;
long Quantity  = 1000000;
  1. //char  LetterCode;
  2. //double SalePrice;
  3. //long  Quantity;
  5. char Lettercode = 'v';
  6. double SalePrice = 67.95;
  7. long Quantity  = 1000000;


And this comes up with 'g++ exer1.c':
Quote:
/usr/lib/gcc-lib/i486-slackware-linux/3.2.3/../../../crt1.o(.text+0x18): In function `_start':
: undefined reference to `main'
collect2: ld returned 1 exit status


So I have no idea what that means, and I don't know why I have to declare the variable type with its value assignment, any ideas why this isn't working, or do I have it right and just can't compile without some sort of "real" script?
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Post February 28th, 2004, 2:38 pm

  • b_heyer
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Post February 28th, 2004, 2:45 pm

Ok the problem came from my stupidity and lack of knowledge with the c++ object oriented programming, but I figured it out, I actually need to encapsule the whole code in main(){ } like:
Code: [ Select ]
main() {
char  LetterCode;
double SalePrice;
long  Quantity;

LetterCode = 'v';
SalePrice = 67.95;
Quantity  = 1000000L;
}
  1. main() {
  2. char  LetterCode;
  3. double SalePrice;
  4. long  Quantity;
  6. LetterCode = 'v';
  7. SalePrice = 67.95;
  8. Quantity  = 1000000L;
  9. }


I also had "Lettercode" instead of "LetterCode" before. :oops:
My real problem is I don't know if I have libraries installed anywhere on my box....
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Post February 29th, 2004, 5:22 am

Yup I was just about to tell you that you need to have at least a main() block. Looks like you figured it out though :)

You probably have many libraries installed on your computer, but it does depend on how you installed your computer. On my home Redhat server I usually install it with every development library/feature possible so that I will not have any problems using a common library if need be.
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  • b_heyer
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Post February 29th, 2004, 1:54 pm

I downloaded the latest full version of gcc and now everything works.
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Post February 29th, 2004, 8:48 pm

Hey b_heyer would you please share that eBook with me pleaseeeeeeeeeeeeeeeeeeeeeeeeeeeeee....
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