Go4Expert - Desperate plee for Help. C program for ATM.

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Desperate plee for Help. C program for ATM.

So heres the scoop. I need to take this code:

Code:

#include "stdio.h"

#include "conio.h"



int value,rem,bill_50,bill_20,bill_10;

void dispenser();



int main(void)

{

printf("**Welcome**\n\n");

dispenser();

getch();

}

void dispenser()

{

int a,b;

printf ("Enter the amount you wish to withdrawl\n");

scanf("%d",&value);



  if(((value%10)==0) && (value>0))

{

    //Calculates 50s                        

    if(value>=50)

    {

    bill_50 = value/50;

    value = value%50;

    printf ("No of 50 Bills is %d \n",bill_50);

    }

    //Calculates 20s

    if((value>=20) && (value<50))

    {

    bill_20 = value/20;

    value = value%20;

    printf ("No of 20 Bills is %d \n",bill_20);

    }

    //Calculates 10s

    if(value==10)

    {

    bill_10 = 1;

    value = value%10;

    printf ("No of 10 Bills is %d \n",bill_10);

    }

    printf("Press 1 for a new transaction and 0 to exit\n");

    scanf("%d",&a);

        

    if(a == 1)

      {

          dispenser();

      }

    if(a == 0)

     {

       printf("Thank you!!");

       exit(0);

     }

  



}

     /*Safety for increments of 10*/

     else

     {

      printf ("Please Enter in Multiples 10 only, thank you \n\n");

      dispenser();

     }







}

and I have to meet my teacher's demands to have it use pointers, and to pass the variables to the function instead of just using global variables.

I have NO idea how to do this. I can't program to save my life, I got this code from my roommate lol.

If anyone can give me an idiot friendly step by step guide, or could just be gracious and fix it, I would be eternally grateful.

Re: Desperate plee for Help. C program for ATM.

OK, so the first step is to make the variables local to main, so change:

Code:

int value,rem,bill_50,bill_20,bill_10;

void dispenser();



int main(void)

{

to:

Code:

void dispenser();



int main(void)

{

    int value,rem,bill_50,bill_20,bill_10;

Then dispenser() needs redefining to take pointers to these as parameters. You should have something somewhere in your course notes that shows an example of a function that takes pointer arguments.

Then within dispenser, change the references to these variables from simple "value" references to pointer references, i.e. "*value" (assuming you keep the same names). For example:

Code:

if(*value>=50)