Another problem dealing with main() and driver function

tommy69 · #1 20-Mar-2004, 18:48

I have another program dealing with a driver function. This is the problem: To see how main() works as a driver function, write main() as part of a complete program to call the function below:

CPP / C++ / C Code:

void draw_line(char what,int length)  /*function definition*/
{

	int ctr;

	for (ctr=0;ctr<length;ctr++)  /*Diver Function*/
		printf("%c",what);
}

So I wrote main() and called the function draw_line. The complete program is:

CPP / C++ / C Code:

#include <stdio.h>
#include <ctype.h>
#include <conio.h>

void draw_line(char what,int length);  /*function declaration */

int main()
{
	char c;		/*define the variables*/
	int x;

	c=3;		/*set the value of the input variables*/
	x=5;

	draw_line(c,x);		/*function call*/

	getch();

	return 0;		/*exit main function*/
}

void draw_line(char what,int length)  /*function definition*/
{

	int ctr;

	for (ctr=0;ctr<length;ctr++)  /*Driver Function*/
		printf("%c",what);
}

Now what I dont understand is why I am getting this weird output:

CPP / C++ / C Code:

if c=2, x=5;
☻☻☻☻☻ 
If c=3, x=5;
♥♥♥♥♥
if c=4, x=5;
♦♦♦♦♦ 
if c=5,x=5;
♣♣♣♣♣
if c=6,x=5;
♠♠♠♠♠
if c=7,x=5;
(My computer beeped and made a funny noise??)
if c=21, x=5;
§§§§§

Why am I getting such strange outputs? And did I write the program correct? After all, I did write main() and it's calling the function draw_line. Thanks for any feedback. I am still trying to learn functions and writing them for the "Driver" functions. Tommy

davekw7x · #2 20-Mar-2004, 19:00

Quote:

Originally Posted by tommy69

c=3; /*set the value of the input variables*/

If c=3, x=5;
♥♥♥♥♥

Why am I getting such strange outputs? And did I write the program correct? After all, I did write main() and it's calling the function draw_line. Thanks for any feedback. I am still trying to learn functions and writing them for the "Driver" functions. Tommy

You want

Code:

   c = '3';

for example.

the character 3 (0x03 hex) shows up as a heart on my Windows terminal.
the character '3' (0x33 hex) shows up as the digit '3'.

Dave

tommy69 · #3 20-Mar-2004, 19:18

Quote:

Originally Posted by davekw7x

You want

Code:

   c = '3';

for example.

the character 3 (0x03 hex) shows up as a heart on my Windows terminal.
the character '3' (0x33 hex) shows up as the digit '3'.

Dave

Now that made me look stupid

I say that because I should know better. I declared c as a character and I was trying to pass a number. I don't know why I didnt pick up on that. Sometimes the littlest mistakes just slips by. Thanks for bringing this little error up. I can change c to ='a' or '3' or anything I want as long as I have the ' ' surrounding the charatcer. Did I write the main() correctly? It seems to work fine to me. Thanks.....Tommy

WaltP · #4 20-Mar-2004, 19:18

As dave said...

What you did is output the value 2 which is the character ☻
3 is ♥
4 is ♦
etc.

These are in the lower 32 bytes of the ASCII table -- the CTRL characters

davekw7x · #5 20-Mar-2004, 19:46

Quote:

Originally Posted by tommy69

Did I write the main() correctly?

By George, I think you've got it!

Onward and upward!!!!

Dave

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