function calls and pointers

I got this compiling but I'm getting no values in my output. Can anyone help out and tell me what I'm doing wrong.

Code:

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

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

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 dollar to be converted:\n" );
  scanf("%d.2f", money);

        convert(money); /* function call */

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

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

{

  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", &USD);

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

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

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

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

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

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

---

Code:

---

My output:


Please enter the number of US dollar 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

---

any problems? :D

Code:

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/* function prototypes */
void currency ( int *Ptr)
{
  /* Do something here */
}

double convert(int money)

{

  int *Ptr0, *Ptr1, *Ptr2, *Ptr3, *Ptr4, *Ptr5;

---

Edit: Since you edited your post, now I have to edit mine... Basically, what you asked about initially should get fixed if you do something similar to what I showed in the above code. Now you just have to deal with all the other 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?:confused:

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?:confused: 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

Of course it will be all 0 because your function return nothing but "0"

Code:

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return 0; /* indicates successful termination */

---

the prototype for convert should be

Code:

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

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then write to that array instead of writing to all those local unallocated pointers.

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 */

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Please help......:confused:!!!

Code:

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int main()
{
...
// money has to be type float.
convert(money,xchange); /* function call */
...
}

---

that function doesn't have to return

Code:

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void convert(float money, const int * xchange)
{

  /* print the converted foreign currencies to the screen */
  printf( "The total amount in US dollars: %8.2f\n", xchange[0]*money);
  // you do the rest of them
} /* end function money */

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Thanks to all who helped me on this project.:)