problem with a function

[p_s_ross]

Hi

I am playing with functions for the first time [note, I am using C, not C++, so main ( ) is OK]. Here is my program:

 	/* test for functions*/
	
	#include <stdio.h>
	float FUNCTION;
	main ( )
	{
		float xi, yi, x_new, y_new, h;	
		xi = 1; yi = 1; h = 0.1;
		y_new = yi + h * FUNCTION( xi, yi );
		x_new = xi + h;
		printf( "x\fy\n" );
		printf( "%f\t%f\n", x_new, y_new );
		}
	}
	float FUNCTION( float X, float Y )
	{
		return X + 3*Y/X;
	}

The compiler returns:

line 12: Parse Error, expecting `','' or `SEP'
'y_new = yi + h * FUNCTION( xi, yi )'
aborting compile

What is wrong? (Thanks)

[SourceCode]

Few things.

float FUNCTION;

Instead of declaring a function prototype you are telling the compiler you want a floating point variable called FUNCTION. Try this

/* See how it matches your definition */
float FUNCTION(float X, float Y);

Also you really should return 0 and use int main (void). My compiler gives me warnings so it can't be a good thing. I'm pretty sure that main() isn't acceptable in c99 also. Another thing, althought it's a matter of style, usually names in all caps are used for defines. There was also an extra } in there. Goodluck.

[p_s_ross]

Dear helper,

I followed all your advice, and now my program compiles.

Thank you.

[Hammer]

Just a side note:

>>I am using C, not C++, so main ( ) is OK<<
http://faq.cprogramming.com/cgi-bin/...&id=1043284376

[CodeMaster]

I am happy that your program compiles.

Just a little piece of advice,
It is always good practice to use a return type,
and have the function return a value.

Stay away from void main()
Indeed it is acceptable but ... think about
return to VOID (?????????)

I hope that this advice is good for you.

[quzah]

Stay away from void main()

Good so far...

Indeed it is acceptable but

Here's your problem. void main is not valid. A simple read of the FAQ would have answered this for you.

5.1.2.2.3 Program Termination

[#1]
...
If the return type is not compatible with int, the termination status returned to the host enviornment is unspeficied.

In short, if you want void man, use Java.

Quzah.

[Zach L.]

Correct me if I'm wrong, but doesn't C assume 'int' if no type is specified? So 'main ( )' is equivalent to 'int main ( )'.

[XSquared]

Read Hammer's link.

[Zach L.]

I did... It didn't seem too clear on that point.

edit: Never mind... I didn't see the word 'only'.