regarding main method

jerry · #1 08-Mar-2004, 20:25

hi im new to the whole File I/O thing so is it possible if i do not include the File I/O codes in the main method?
such as i have another method which i did separately from the main method. I'll only invoke this method when i call it in the main. does it work? i mean will it work?
example:

CPP / C++ / C Code:

int main()
{
singleShots();
return 0;
}

int singleShots()
{
//my codes
}

dsmith · #2 08-Mar-2004, 20:29

Hello Jerry.

I am not sure what you mean. So far your code is 100% valid as long as you declare you function singleShots as follows:

CPP / C++ / C Code:

int singleShots();

int main()
{
singleShots();
return 0;
}

int singleShots()
{
//my codes
}

You can avoid this declaration if you put singleShots above your main function. What is "my codes" going to do?

jerry · #3 08-Mar-2004, 20:40

oh i guess it means it should b ok...coz i thought i need a main method for the File I/O codes...
oh yes i have a couple of errors:

CPP / C++ / C Code:

int single_shot(int a,int b)
	{
		std::ofstream file("measurements.txt", ios::app);
		file << "SINGLE\n";
		send_command(a,MSG_SINGLE_SHOT,0);
		if (!get_response(b,DATA_PACKET))
		return(FALSE);

		file << parse_data(&response) << "\n";
		
		file.close();
		return(TRUE);
	}

errors:
error C2143: syntax error : missing ';' before ':'
error C2065: 'file' : undeclared identifier
error C2297: '<<' : illegal, right operand has type 'char [8]'
error C2297: '<<' : illegal, right operand has type 'char [2]'
error C2224: left of '.close' must have struct/union type

when i added the 'std::' the syntax error appeared after i compiled...i chked all the syntax there's nothing wrong

??:

dsmith · #4 08-Mar-2004, 20:47

Is this at the top of your file?

CPP / C++ / C Code:

#include <iostream>
#include <fstream>

Also, I have found in C++ files that if you include

CPP / C++ / C Code:

using namespace std;

near the top of the file you shouldn't have to use the std:: before the types.

Quite frankly, I am not a great c++ programmer. I mostly use C style programming. If you are still gettin errors, why don't you post the entire thing. If it is long, you can post it as an attachment.

jerry · #5 08-Mar-2004, 20:58

i included both files

CPP / C++ / C Code:

#include <iostream.h>
#include <fstream.h>

if i included the namespace thing, the compiler cant identify it. i dont know why. it will give me an error: undeclared identifier. yeah my codes are long. mayb i should just attach it n you take a look...it's ok if you cant solve it too...it's such a headache!

dsmith · #6 08-Mar-2004, 21:28

Jerry, what compiler are you using? This is a basic C file (it has a .c extension and most of it seems to be standard c). Is there a reason that you are adding the single_shot function using c++ syntax?

The gcc compiler for example will compile the program based upon the extension (.c is c, .cpp is c++). Basically if this is getting compiled as a c file, what you have added will not work.

jerry · #7 08-Mar-2004, 21:30

really??? oh gosh....ok...so this means i should change all the codes into c? or just change the compiler? oh my....i've been spending time on it like....for so many weeks!

WaltP · #8 08-Mar-2004, 21:31

dsmith suggested

CPP / C++ / C Code:

#include <iostream>
#include <fstream>

You included:

CPP / C++ / C Code:

#include <iostream.h>
#include <fstream.h>

Do you notice a difference? Try dsmith's suggestion again.

dsmith · #9 08-Mar-2004, 21:34

Quote:

Originally Posted by jerry

really??? oh gosh....ok...so this means i should change all the codes into c? or just change the compiler? oh my....i've been spending time on it like....for so many weeks!

Jerry, if it were me I would code it in C syntax to begin with.

Anyway, what compiler are you using. Are you telling it to compile as a c++ program? A c program can be compiled as a c++ program, but not vice a versa. Also, just for semantics you should change the extension to .cpp

aaroncohn · #10 08-Mar-2004, 22:23

Didn't you post something exactly like this under a different name a week ago, jerry?

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