Old style stuff

[CAP]

Ok I am using Microsoft's Visual C++ compiler and I am just playing around with unary math operators to see how they work and what they do so anyways, I decided to try a for(whatever) function and I almost got it except my compiler complains about me using "old style formal list" or something like that here it is:

printLine();
{
	for(c>0; c--)
	{
		printf("Line %d", c);
	}
}

Ok that is what is messing up, I know it is because I have the semi colon after printLine() but if I don't put it it I get:
"missing ';' before ')'"
and 2 warnings as well, can anyone help out here please.

[sean345]

You need to create the variable C. Try something like this:

void printLine(void);
{
	for(int c=80;c>0; c--)
	{
		printf("Line %d", c);
	}
}

- Sean

[Prelude]

>printLine();
Lose the semicolon. The reason this is considered old style is because the parameter list for the function is empty. An empty list according to K&R C means an unknown number of arguments. ISO C requires that a function which takes no parameters is declared as void:

printLine ( void )

You also need to define a return type since the new C99 standard doesn't allow implicit int by omitting a return type.

>for(c>0; c--)
c is not decared anywhere and a for loop has three parts, initialization, condition, increment:

int c;
for ( c = someval; c > 0; c-- )

-Prelude

[quzah]

You need to create the variable C. Try something like this:

for(int c=80;c>0; c--)

This is not valid C code, unless the newer standard introduced C++ style variable declaration. You cannot just introduce a new variable in the beginning of a for loop in C. You'd have to declare 'int c;' on the line before the loop.

Quzah.

[Prelude]

>unless the newer standard introduced C++ style variable declaration
It did, but it's still best to remain conformant to C89 until the new standard is in full use.

-Prelude

[CAP]

Ok, I got rid of the semi colon put in void and then for the error that it gave me about the for() thing, I just had to make it complete by not defining the variable c before hand, I just changed it to:

for(c=5; c>0; c--) and it workd, thanks a lot though