// Description: Calculates the total value in euros of a jar
//              containing various euro coins.
//
// Euro coin denominations:
//   2 euro, 1 euro,
//   50 cent, 20 cent, 10 cent, 5 cent, 2 cent, 1 cent
//
//**************************************************************

#include <stdio.h>

// Conversion constants (all values in euro cents)
#define TWO_EURO       200
#define ONE_EURO       100
#define FIFTY_CENT      50
#define TWENTY_CENT     20
#define TEN_CENT        10
#define FIVE_CENT        5
#define TWO_CENT         2
#define ONE_CENT         1

#define CENTS_PER_EURO 100.0  // used to convert cents to euros

//**************************************************************
// Function: calcEuros
//
// Purpose: Calculates the total value in euros given the count
//          of each euro coin denomination in a jar.
//
// Parameters:
//
//   twoEuro    - number of 2 euro coins
//   oneEuro    - number of 1 euro coins
//   fiftyCent  - number of 50 euro cent coins
//   twentyCent - number of 20 euro cent coins
//   tenCent    - number of 10 euro cent coins
//   fiveCent   - number of 5 euro cent coins
//   twoCent    - number of 2 euro cent coins
//   oneCent    - number of 1 euro cent coins
//
// Returns:
//
//   totalEuros - the total value of all coins in euros (float)
//
//**************************************************************

float calcEuros (int twoEuro,   int oneEuro,
                 int fiftyCent, int twentyCent,
                 int tenCent,   int fiveCent,
                 int twoCent,   int oneCent)
{
    int totalCents; // running total in euro cents
    
    // sum up the value of all coins in euro cents
    totalCents = (twoEuro    * TWO_EURO)    +
                 (oneEuro    * ONE_EURO)    +
                 (fiftyCent  * FIFTY_CENT)  +
                 (twentyCent * TWENTY_CENT) +
                 (tenCent    * TEN_CENT)    +
                 (fiveCent   * FIVE_CENT)   +
                 (twoCent    * TWO_CENT)    +
                 (oneCent    * ONE_CENT);

    // convert cents to euros and return
    return (totalCents / CENTS_PER_EURO);

} // calcEuros


// main function to test calcEuros
int main ()
{
    // coin counts for the test case
    int twoEuro    = 5;
    int oneEuro    = 2;
    int fiftyCent  = 2;
    int twentyCent = 5;
    int tenCent    = 15;
    int fiveCent   = 0;
    int twoCent    = 0;
    int oneCent    = 2;

    float totalEuros; // result from calcEuros

    // call the function to calculate total euros
    totalEuros = calcEuros(twoEuro, oneEuro,
                           fiftyCent, twentyCent,
                           tenCent, fiveCent,
                           twoCent, oneCent);

    // print the coin counts
    printf("\n--- Coins in the Jar ---\n");
    printf("  2 Euro coins    : %d\n", twoEuro);
    printf("  1 Euro coins    : %d\n", oneEuro);
    printf(" 50 Cent coins    : %d\n", fiftyCent);
    printf(" 20 Cent coins    : %d\n", twentyCent);
    printf(" 10 Cent coins    : %d\n", tenCent);
    printf("  5 Cent coins    : %d\n", fiveCent);
    printf("  2 Cent coins    : %d\n", twoCent);
    printf("  1 Cent coins    : %d\n", oneCent);

    // print the result
    printf("\nTotal Value: %.2f Euros\n", totalEuros);

    return 0;

} // main