Clearing the screen joking :)

I am writing a C program for a vending machine and I display the drink types and prices then prompt the user to input a coin (integer) then repeat until they enter '0'. After each coin is inserted the credit must be displayed on screen.

What I was wondering was if there is a way of placing the cursor up a few lines or clear PART of the screen so that I don't have something like this:

Insert coin: 10
Credit: 10
Insert coin: 5
Credit 15
Insert coin: _

etc etc

I know I could just clear the screen before each insert but I want the prices displayed all the time.

I cannot find anything on it in my books or in the documentation of the compiler...I would greatly appreciate any help

btw Don't flame me for asking how to clear the screen because it's not a straight forward clear
oh yeah and I'm using Turbo C.

Well, using Turbo C you might be able to use the old ANSI Escape Sequences

the page is unavailable

http://sunsite.nus.edu.sg/pub/os2/os...aq.2.0062.html

Originally posted by marell
I know I could just clear the screen before each insert but I want the prices displayed all the time.

Why not print the required stuff immediately after clearing the screen ? it's just going to happen in a flash..

Originally posted by nymph
Why not print the required stuff immediately after clearing the screen ? it's just going to happen in a flash..

I know I could just do that but it's for an assignment so I was hoping there was a less wasteful way of doing it, you know what tutors are like

So how would I incorporate this - ESC[#A - into my code:

Code:

 
 #include <stdio.h>

 void initialise(void);
 void process_drink(void);
 void dispense_change(void);

 int credit, code, coin, cost;

/***** FUNCTION 0 *************************************************/
 main()
 {
	system ("cls");
	initialise();
	process_drink();
	dispense_change();
	return 0;
 }

/***** FUNCTION 1 *************************************************/
 void initialise(void)
 {
	credit = 0;
 }

/***** FUNCTION 2 *************************************************/
 void process_drink(void)
 {
/** DISPLAY DRINK TYPES **/

	printf("Available drinks:");
	printf("\n\nCoffee Black          - 100  45p");
	  printf("\nCoffee Black & Sugar  - 101  45p");
  	  printf("\nCoffee White          - 110  45p");
	  printf("\nCoffee White & Sugar  - 111  45p");
	printf("\n\nTea                   - 200  45p");
	  printf("\nTea & Sugar           - 201  45p");
	printf("\n\nHot Chocolate         - 300  45p");

/** INPUT COINS **/

	printf("\nAccepted coins: \n5p\n10p\n20p\n50p\n100p\n200p");
	printf("\nEnter `0' to end coin insertion");
	printf("\nEnter coin: ");
	scanf("%d",&coin);

	while(coin != 0)
	{
/** VALIDATE COIN **/

		while((coin != 5) && (coin != 10)) 
		{
			printf("\nThat coin was invalid!");
			printf("\nEnter another: ");
			scanf("%d",&coin);
		}

		credit = credit + coin;

		system ("cls");

		printf("\n\nCredit: %d",credit);

		printf("\nEnter coin: ");
		scanf("%d",&coin);
	}
 }






 void dispense_change(void)
 {
 }

It's not portable code, but I think in Turbo C you can use gotoxy().

Code:

#include <conio.h>
.
.
gotoxy(x,y);

Not portable? So if the screen resolution was different on my tutors PC it would goto a different row?

Is there afunction that gets the location of the cursor?

http://faq.cprogramming.com/cgi-bin/...&id=1043284385
http://faq.cprogramming.com/cgi-bin/...&id=1043284392

http://msdn.microsoft.com/library/de...orposition.asp

Originally posted by marell
So how would I incorporate this - ESC[#A - into my code

Code:

#define  ESC  0x1B
...
printf("%c[#A", ESC);

is one way to do it.

Code:

char *cursorUp = "\x1B[#A";
...
printf("%s", cursorUp);

is another.

Using this code:

Code:

 #include <stdio.h>
 #define  ESC  0x1B


 void initialise(void);
 void process_drink(void);
 void dispense_change(void);

 int credit, code, coin, cost;

/***** FUNCTION 0 *************************************************/
 main()
 {
	system ("cls");
	initialise();
	process_drink();
	dispense_change();
	return 0;
 }

/***** FUNCTION 1 *************************************************/
 void initialise(void)
 {
	credit = 0;
 }

/***** FUNCTION 2 *************************************************/
 void process_drink(void)
 {
/** DISPLAY DRINK TYPES **/

	printf("Available drinks:");
	printf("\n\nCoffee Black          - 100  45p");
	  printf("\nCoffee Black & Sugar  - 101  45p");
  	  printf("\nCoffee White          - 110  45p");
	  printf("\nCoffee White & Sugar  - 111  45p");
	printf("\n\nTea                   - 200  45p");
	  printf("\nTea & Sugar           - 201  45p");
	printf("\n\nHot Chocolate         - 300  45p");

/** INPUT COINS **/

	printf("\nAccepted coins: \n5p\n10p\n20p\n50p\n100p\n200p");
	printf("\nEnter `0' to end coin insertion");
	printf("\nEnter coin: ");
	scanf("%d",&coin);

	while(coin != 0)
	{
/** VALIDATE COIN **/

		while((coin != 5) && (coin != 10) && (coin != 20) &&
		(coin != 50) && (coin != 100) && (coin != 200))
		{
			printf("\nThat coin was invalid!");
			printf("\nEnter another: ");
			scanf("%d",&coin);
			if(coin == 0)
			return;
		}

		credit = credit + coin;

		printf("%c[2A", ESC);

		printf("\n\nCredit: %d",credit);

		printf("\nEnter coin: ");
		scanf("%d",&coin);
	}
 }






 void dispense_change(void)
 {
 }

the only difference made is that

Code:

 (left arrow)[2A

is printed. I know I sound like a complete amatuer but plz help

Please when posting code that you have a question about, don't post the entire program unless it's relevant. You only need to post the few lines that contain the problem.

I remember now you need to add
[code]device=path\ANSI.sys[/quote]
to your config.sys file to process the ANSI commands. It's in the windows\system32 directory in many of the Windows systems. Replace path above with the appropriate directory

My suggestion would be just to re-print the menu everytime with the updated credit. It's really silly and useless to try and code around it. BTW, your menu could use some extra formatting.

Originally posted by WaltP
I remember now you need to add
[code]device=path\ANSI.sys
to your config.sys file to process the ANSI commands. It's in the windows\system32 directory in many of the Windows systems. Replace path above with the appropriate directory

would this have to be done on every PC that ran the program?

If it would, I think I will just print the prices each time. After all it's only HNC level

Anywayz thnx for all the feedback guys