Thread: function calls and pointers

any problems?

Sorry for editing so quickly and thanks for your reply. I got it compiling but I can't seem to get the function call to read the values from the array in main. Any ideas on what to do here?

You'll have to pass that array to your function, just like you passed the input value money into your function.

@tabstop.....I totally agree but how would I do that?

The same way you passed your variable "money" to the function.

I'm just a C newb. The way that moeny was passed is through a function call "convert(money);" Can you provide an example on how I would pass the values of the array into the function? Help please!

convert(money, other_things, those_things_over_here, change_under_the_sofa_cushions)

Ok.......it's still giving me no value in the output. Any ideas on what to do here?

convert(money); /* function call */
convert(xChange); /* function call */



Please enter the number of US dollars to be converted:
1
The total amount in US dollars: 0.00
The total amount in Euro dollars: 0.00
The total amount in Canadian dollars: 0.00
The total amount in Japanese Yen: 0.00
The total amount in British Pounds: 0.00
The total amount in Davidian dollars: 0.00
The total amount in US dollars: 0.00
The total amount in Euro dollars: 0.00
The total amount in Canadian dollars: 0.00
The total amount in Japanese Yen: 0.00
The total amount in British Pounds: 0.00
The total amount in Davidian dollars: 0.00

Ok....I modified the prototype....but now getting compiler errors again.

currency1.c: In function `main':
currency1.c:39: too few arguments to function `convert'
currency1.c:40: warning: passing arg 1 of `convert' makes integer from pointer without a cast
currency1.c:40: too few arguments to function `convert'

Code:

#include <stdio.h>
#include <time.h>
#define SIZE 5

/* function prototypes */
double convert(int money, int * xchange);

int main()
{
   /* variable and array declarations */
   int money;
   srand( time(NULL));
   
   float xchange[] = { 1.00, 1.3593, 1.0013, 83.1300, 1.5837, rand(time)%100 };
      
	/*
	 * As of January 30, 2011, the current exchange values from www.google.com/finance.
	 * USD (United States Dollar) = 1.00
	 * EUR (Euro Dollar) = 1.3593
	 * CAD (Canadian Dollar) = 1.0013
	 * JPY (Japanese Yen) = 83.1300
	 * GBP (Great Britian Pound) = 1.5837
	 * DDS (Davidian Dollar Standard) = 3.56
	 */

   /* prompt the user to enter a US dollar amount */
   printf( "Please enter the number of US dollars to be converted:\n" );
   scanf("%d.2f", money);

	convert(money); /* function call */
	convert(xchange); /* function call */

//return 0; /* indicates successfull termination */
} /* end main function */

/* function prototypes */
double convert(int money, int * xchange)

{

   int *Ptr0, *Ptr1, *Ptr2, *Ptr3, *Ptr4, *Ptr5;
   int USD, EUR, CAD, JPY, GBP, DDS;
   Ptr0 = &USD;
   Ptr1 = &EUR;
   Ptr2 = &CAD;
   Ptr3 = &JPY;
   Ptr4 = &GBP;
   Ptr5 = &DDS;

   /* print the converted foreign currencies to the screen */
   *Ptr0 = 1.00 * money; /* USD */
   printf( "The total amount in US dollars: %8.2f\n", xchange);

   *Ptr1 = 1.3593 * money; /* EUR */
   printf( "The total amount in Euro dollars: %8.2f\n", xchange);

   *Ptr2 = 1.0013 * money; /* CAD */
   printf( "The total amount in Canadian dollars: %8.2f\n", xchange);

   *Ptr3 = 83.1300 * money; /* JPY */
   printf( "The total amount in Japanese Yen: %8.2f\n", xchange);

   *Ptr4 = 1.5837 * money; /* GBP */
   printf( "The total amount in British Pounds: %8.2f\n", xchange);

   *Ptr5 = rand(time)%100 * money; /* DDS */
   printf( "The total amount in Davidian dollars: %8.2f\n", xchange);

return 0; /* indicates successful termination */
} /* end function money */

Please help......!!!

Thanks to all who helped me on this project.