functions

[codenewb]

When I'm using functions in code do I use them to replace my if
statements, I guess I'm just not certain where to put them.
I am supposed to change the code in this and add functions.

#include <stdio.h>

#define REGFEE 35.00
#define SURCHG 15.00
#define CITYV  20.00

main()
{
	void GetCtype();
	void GetVtype();
	int vtype, ctype, custcount = 0;
	char answer;
	double totfee, totcustchg = 0.0;


do
{
	int GetCtype();
	printf("\nPlease enter a 1 for Luxury Car, or 2 for Other Car: ");
	scanf("%d", &vtype);

	if (!(vtype ==1 || vtype == 2))
	{
		printf("\nInvalid Data Entered: ");
	}
	else
	{
		int GetVtype();
		printf("\nPlease enter a 1 for City Vehicle, or 2 for Non-City Vehicle: ");
		scanf("%d", &ctype);
		if (!(ctype ==1 || ctype ==2))
		{
			printf("\nInvalid Data Entered: ");
		}
		else
		{
		
			if ((vtype == 1) && (ctype ==1))
			{
				totfee = REGFEE + SURCHG + CITYV;
			}
			else
			{
				totfee = REGFEE + SURCHG;

					if ((vtype ==2) && (ctype ==2))
					{
						totfee = REGFEE;
					}
					else
					{
						totfee = REGFEE + CITYV;
					}
			}
		}
	}

				printf("\nTotal Fee %.2f\n", totfee);
				
			
		
	

	//Accumulators
	++custcount;
	totcustchg += totfee;

	//Prompt for another car
	printf("\nDo you want to process another vehicle?(y/n): ");
	getchar();
	answer = getchar();
}
while (( answer == 'y') || (answer == 'Y') );

	//Display summary info
	printf("\nTotal number of cars processed:              %d\n", custcount);
	printf("\nTotal registration fee for all automobiles: $%.2lf\n", totcustchg);


	

}

[kuphryn]

I recommend that you reread the chapter on function in your C++ book.

Kuphryn

[wbartley]

One important purpose of functions is to make your code more readable and also easier to test. Isn't the following easier to read than the program you presented?

enum VehicleType { luxury, other };
enum VehicleUse {city, noncity };

VehicleType GetVehicleType()
{
// Code to get vehicle type from user
}

VehicleUse GetVehicleUse()
{
// Code to get vehicle use from user
}

int main(void)
{
do {
VehicleType vtype = GetVehicleType();
VehicleUse vuse = GetVehicleUse();
int totalFee = REGFEE;
if (vtype == luxury){
totalFee += SURCHG;
}
if (vuse == city){
totalFee += CITYV
}
// Compute your stats
} while (// more cars to process);
}

[codenewb]

I see now, I was confused on how I would enter
the functions regarding the if statement. Your reply
made it a bit easier to comprehend, thanks.