/*include the library*/
#include <stdio.h>
/*define the five currencies used for the conversion*/
#define Currency1 0.58
#define Currency2 2.50
#define Currency3 3.69
#define Currency4 21.00
#define Currency5 1.75
/*function prototyping*/
void menu (int *);
float calculateConversion(int, float);
/*main function of the program*/
int main()
{
     /*declare variables*/
     float us;
     float conversion;
     int choice;
     /*call user selection menu by reference*/
     menu(&choice);
     /*prompt user to enter amount of US to convert*/
     printf("Please enter an amount in US Dolalrs to convert: $");
     /*store user entry into memeory*/;
     scanf("%f",us);
     /*call conversion function by value*/
     calculateConversion (choice, us);
     /*print results of conversion*/
     printf("The amount of that currency in US Dollars is: $%.2f\n", conversion);
     /*display results*/
     getchar();
     /*terminate program*/
     return 0;
}
/*function definition by reference*/
void menu(int *CHOICE)
{
     /*local variables for menu()*/
     int choice;
     /*show options to user*/
     printf("Welcome to the currency conversion program\n");
     printf("Press number 1 to 5 to select a currency to convert\n");
     printf("Press [1] for Pounds\n");
     printf("Press [2] for Deutchmarks\n");
     printf("Press [3] for Francs\n");
     printf("Press [4] for Pesetas\n");
     printf("Press [5] for Canadian Dollars\n");
     /*store choice in memory*/
     scanf("%d", &choice);
     /*set value of referenced variable*/
     *CHOICE = choice;
}
/*function definition by value*/
float calculateConversion(int CHOICE, float us)
{
   /*local variable for conversion*/
   float conversion;
   /*switch to user the case selected by user in reference funtion*/
   switch (CHOICE)
     {
       case 1:
            conversion=Currency1*us;
            break;
       case 2:
            conversion=Currency2*us;
            break;
       case 3:
            conversion=Currency3*us;
            break;
       case 4:
            conversion=Currency4*us;
            break;
       case 5:
            conversion=Currency5*us;
            break;
     }
/*returns the new value to the main function*/
return conversion;
}