I've gotten this far, but I don't know how to use the 'function' properly... I've tried several things, but keep coming back to this base code because I know it works.
Can anyone give me a better idea of how to take this part of the coding in the switch:
And make it a function? Problem is that I can't figure out how to pass the menu selection as an argument and get the right result. I keep getting mixed responses.Code:printf("\nPlease Enter the Amount in x.xx Hong Kong Dollars to Convert.\n$");
scanf("%f", &f_input_AMT); //get AMT input from User for HKD conversion
f_result[4] = f_input_AMT * f_const_HKD;
printf("\n$%.2f Hong Kong Dollars is equal to $", f_input_AMT);
printf("%.2f US Dollars.\n\n", f_result[4]);
I understand that I'm going to have to do something like this:
I just don't quite get how to figure out how to get the argument from my menu selection and tell the program what constant to use in the calculation.Code:getCurrencyValue(void)
printf("\nPlease Enter the Amount in x.xx (first argument) to convert. \n$)", (first argument);
scanf("%f", $f_input_AMT); //get amt for conversion
f_result[4] = f_input_AMT * f_const_(need argument here to define what constant to use);
printf("\n$.2f (first argument) is equal to $", f_input_AMT);
printf("%.2f US Dollars.\n\n", f_result[4]);
Any help, tips, pointers are appreciated.
Full Program
Code://Currency Conversion Program
//Written by ***********, University of Phoenix
//Version 3 4/2/2006
#include <stdio.h>
#include <system.h>
#include <stdlib.h>
#include <ctype.h>
//global variable declarations and initialization with foreign exchange rates from <http://www.xe.com/ucc.convert.cgi> as of 4/2/2006
//this global variable defnition is to remain constant throughout use in the program
#define f_const_USD 1.00; //1.00 USD = 1.00 USD *United States Dollar*
#define f_const_GBP 1.73710; //1.00 GBP = 1.73710 USD *United Kingdom Pounds*
#define f_const_CAD 0.855872; //1.00 CAD = 0.855872 USD *Canadian Dollars*
#define f_const_MXN 0.0919608; //1.00 MXN = 0.0919608 USD *Mexican Pesos*
#define f_const_JPY 0.00849675; //1.00 JPY = 0.00849675 USD *Japanese Yen*
#define f_const_HKD 0.128871; //1.00 HKD = 0.128871 USD *Hong Kong Dollars*
main(void) //Main Program for Currency Conversion
{
//The following f_input variable is for storing the AMT input from the user, declared initially as '0'
float f_input_AMT = 0.00;
//The following f_result array is for storing calculations within the program declared initially as '0'
float f_result[4] = {0.00};
// f_result[0] = United Kingdom Pounds
// f_result[1] = Canadian Dollars
// f_result[2] = Mexican Pesos
// f_result[3] = Japanese Yen
// f_result[4] = Hong Kong Dollars
//variable declaration for menu input, default is '0'
int i_menu_choice = '0';
do //Do while structure so program will continue until user selects 6 to exit
{
do //Error Checking Loop Structure for Menu Selection
{
//create menu to choose currency conversion type
printf("\n\tCurrency Conversion\n"); //Title of Program
printf("\n1\tConvert United Kingdom Pounds to US Dollars");
printf("\n2\tConvert Canadian Dollars to US Dollars");
printf("\n3\tConvert Mexican Pesos to US Dollars");
printf("\n4\tConvert Japanese Yen to US Dollars");
printf("\n5\tConvert Hong Kong Dollars to US Dollars");
printf("\n6\tExit Currency Conversion Program\n\n");
//Accept input for menu selection
printf("Please make your selection now: ");
i_menu_choice = getchar();
//switch structure for menu selection
switch (i_menu_choice)
{
case '1':
printf("\nYou Selected Conversion from United Kingdom Pounds to US Dollars.");
do //begin do structure to error check f_input_AMT for digits
{
printf("\nPlease Enter the Amount in x.xx United Kingdom Pounds to Convert.\n$");
scanf("%f", &f_input_AMT); //get AMT input from User for GBP conversion
f_result[0] = f_input_AMT * f_const_GBP;
printf("\n$%.2f United Kingdom Pounds is equal to $", f_input_AMT);
printf("%.2f US Dollars.\n\n", f_result[0]);
}
while (isdigit (f_input_AMT)); //end do structure to error check f_input_AMT for digits
break;
case '2':
printf("\nYou Selected Conversion from Canadian Dollars to US Dollars.");
do //begin do structure to error check f_input_AMT for digits
{
printf("\nPlease Enter the Amount in x.xx Canadian Dollars to Convert.\n$");
scanf("%f", &f_input_AMT); //get input from User for CAD conversion
f_result[1] = f_input_AMT * f_const_CAD;
printf("\n$%.2f Canadian Dollars is equal to $", f_input_AMT);
printf("%.2f US Dollars.\n\n", f_result[1]);
}
while (isdigit (f_input_AMT)); //end do structure to error check f_input_AMT for digits
break;
case '3':
printf("\nYou Selected Conversion from Mexican Pesos to US Dollars.");
do //begin do structure to error check f_input_AMT for digits
{
printf("\nPlease Enter the Amount in x.xx Mexican Pesos to Convert.\n$");
scanf("%f", &f_input_AMT); //get input from User for MXN conversion
f_result[2] = f_input_AMT * f_const_MXN;
printf("\n$%.2f Mexican Pesos is equal to $", f_input_AMT);
printf("%.2f US Dollars.\n\n", f_result[2]);
}
while (isdigit (f_input_AMT)); //end do structure to error check f_input_AMT for digits
break;
case '4':
printf("\nYou Selected Conversion from Japanese Yen to US Dollars.");
do //begin do structure to error check f_input_AMT for digits
{
printf("\nPlease Enter the Amount in x.xx Japanese Yen to Convert.\n$");
scanf("%f", &f_input_AMT); //get AMT input from User for JPY conversion
f_result[3] = f_input_AMT * f_const_JPY;
printf("\n$%.2f Japanese Yen is equal to $", f_input_AMT);
printf("%.2f US Dollars.\n\n", f_result[3]);
}
while (isdigit (f_input_AMT)); //end do structure to error check f_input_AMT for digits
break;
case '5':
printf("\nYou Selected Conversion from Hong Kong Dollars to US Dollars.");
do //begin do structure to error check f_input_AMT for digits
{
printf("\nPlease Enter the Amount in x.xx Hong Kong Dollars to Convert.\n$");
scanf("%f", &f_input_AMT); //get AMT input from User for HKD conversion
f_result[4] = f_input_AMT * f_const_HKD;
printf("\n$%.2f Hong Kong Dollars is equal to $", f_input_AMT);
printf("%.2f US Dollars.\n\n", f_result[4]);
}
while (isdigit (f_input_AMT)); //end do structure to error check f_input_AMT for digits
break;
case '6':
return 0; //end program
default:
printf("\nYou Have Made and Invalid Selection. Please Try Again.\n\n\n");
i_menu_choice = getchar();
} //end switch
} //end error check do while for menu selection criteria
while (!isdigit(i_menu_choice) || (i_menu_choice , '1') && (i_menu_choice > '6'));
} //end program run do while statement
while (i_menu_choice != '6');
} //end main program
