No arrays allowed

[jtho117]

HI, I need to create a program that displays the amount of change due... without an array and I don't know how. This is what I have.

/* Change Dispenser */

#include <stdio.h>
#include <math.h> 
 
void say_hello (void);
double change_due ( double change, double dollar[9]);         /* PCF prototypes$
int main()
{
        
double purchase_total, total_paid, change, chaange, dollar[9];
char repeat;            /* Local variables are declared */

 for( ; ; )
{
        say_hello();                    /* PCF 1, no parmeters or arguments */
        
        printf("Please enter total of purchase:$ ");   /* Obtain total */
        scanf("%lf", &purchase_total);
        
        printf(" Please amount tendered:$ ");  /* Obtain amount paid */   
        scanf("%lf", &total_paid);

 change = total_paid - purchase_total; /* Calculate chnage due */
        chaange = change;
        
        change_due(change, dollar);     /* PCF 2, argument, and 2 paramaters */
        
        printf(" Your change due:$%.2lf \n %.lf - 50('s)\n %.lf - 20('s)\n");
        printf(" %.lf - 10('s)\n %.lf - 5('s)\n %.lf('s)\n");
        printf("%.lf - quarter(s)\n %.lf - dime(s)\n %.lf - nickel(s)\n");
        printf("%.lf - penny(s)\n, chaange, dollar[0], dollar[1],");
        printf("dollar[2], dollar[3], dollar[4], dollar[5], dollar[6],");
        printf("dollar[7], dollar[8]");
        
        printf( "Enter y or n to repeat." );
        scanf("%c", &repeat);
        if ( !repeat) break;
}
        return (0);
}
                
        void say_hello(void)
       {
        printf(" Hi welcome to my Change Machine program! ");
       }
        
double change_due(double change, double dollar[9])
{
        for(50.00 <= change, dollar[0] = 0; 50.00 <= change; dollar[0]++)
        {
                change -= 50.00;
        }
 for(20.00 <= change, dollar[1] = 0; 20.00 <= change; dollar[1]++)
        {
                change -= 20.00;
        }
        for(10.00 <= change, dollar[2] = 0; 10.00 <= change; dollar[2]++)
        {
                change -= 10.00;
        }
 for(5.00 <= change, dollar[3] = 0; 5.00 <= change; dollar[3]++)
        {
                change -= 5.00;
        }
        for(1.00 <= change, dollar[4] = 0; 1.00 <= change; dollar[4]++)
        {
                change -= 1.00;
        }
        for(0.25 <= change, dollar[5] = 0; 0.25 <= change; dollar[5]++)
        {
                change -= 0.25;
        }
for(0.10 <= change, dollar[6] = 0; 0.10 <= change; dollar[6]++)
        {
                change -= 0.10;
        }
        for(0.05 <= change, dollar[7] = 0; 0.05 <= change; dollar[7]++)
        {
                change -= 0.05;
        }
 for(0.01 <= change, dollar[8] = 0; 0.01 <= change; dollar[8]++)
        {
                change -= 0.01;
        }
                
        return(0);

[kamillion]

Interesting..., have you thought about using a linked list?

[jtho117]

What is a linked list? I am new to programming, is that like pointers and such?

[Spookster]

Originally Posted by jtho117

What is a linked list? I am new to programming, is that like pointers and such?

http://en.wikipedia.org/wiki/Linked_list

[kamillion]

Originally Posted by jtho117

What is a linked list? I am new to programming, is that like pointers and such?

Lol, Yes, they involve pointers. Basically a linked list is an object (class) with one or two pointers referencing the previous and or next object (or node) in the series. You can use this in place of an array. I don't know if you've covered classes, or objects yet in your class (im assuming). But a better question would be why are you using an array in this code. I honestly don't see the reason for it or any data structure for that matter.

Hint: use the functions to calculate change instead of an array.
//call functions and assign returned value of that function to variable
fifty = fifty_dollar();
..
..
..
penny = penny();

//create functions
fifty_dollar(){
...
return x
}

etc_dollar(){
...
}

I hope this helps