/*Program 6 Validation, For and Switch Oh My!*/
/*Eric Moffett: dblefault@yahoo.com*/
/*3/01/01*/

#include <stdio.h>

int main()
{
 int customer; /*number of customers*/
 int gastype;  /*type of gas*/
 int counter;  
 int regCustomers=0; /*used for the number of regular customers*/
 int plusCustomers=0; /*used for the number of plus customers*/
 int supCustomers=0;  /*used for the number of super customers*/
 double regGallons=0; /*used for the number of regular gallons*/ 
 double plusGallons=0; /*used for the number of plus gallons*/
 double supGallons=0; /*used for the number of super gallons*/
 double regRevenues=0; /*used for the number of regular revenues*/
 double plusRevenues=0; /*used for the number of plus revenues*/
 double supRevenues=0; /*used for the number of super revenues*/
 double gallons;  /*gallons purchased by customer*/
 double total;  /*cost for each individual customer*/
 double regular=1.399;   /*cost of regular gas*/
 double plus= 1.499;     /*cost of plus gas*/
 double super= 1.599;    /*cost of super gas*/
 double revenues=0;      /*toytal revenues of all gas*/

 
 /*Enter number of customers*/
 printf("Welcome to the GasCo Calculator Program\n");
 printf("How many customers to process right now?\n");
 scanf("%d", &customer);

 
 /*loop used to prevent negative inputs*/
 while (customer<0)
 {
	printf("Welcome to the GasCo Calculator Program\n");
	printf("How many customers to process right now?\n");
	scanf("%d", &customer);
 }

 /*loop used to run through all customers*/
 for (counter=1; counter<=customer; counter++)
 {
	printf("Please enter gas type (1 - regular; 2 - plus; 3 - super):");
	scanf("%d", &gastype);  /*customer enters gastype to purchase*/

	
	/*loop used to prevent invalid input by user*/
	while (gastype!=1 && gastype!=2 && gastype!=3)
	{
		printf("Please enter gas type (1 - regular; 2 - plus; 3 - super):");
		scanf("%d", &gastype);
	}

	printf("\n");

	
	/*switch used to handle the three types of gas*/
	switch ( gastype )
	{
		case 1:   /*regular gas*/
			printf("Please enter the number of gallons purchased (between 1/2 and 30): ");
			scanf("%lf", &gallons);
			printf("\n");

			/*loop used to prevent invalid input*/
			while (gallons< 0.5 || gallons>30.0)
			{
				printf("Please enter the number of gallons purchased (between 1/2 and 30): ");
				scanf("%lf", &gallons);
				printf("\n");
			}

			total= gallons * regular;  /*calulates cost for customer*/
			regCustomers++;            /*keeps total of regular customers*/
			regGallons= regGallons + gallons;  /*keeps total of regular gallons*/
			regRevenues= regRevenues + total;  /*keeps total of regular revenues*/
			revenues= revenues + total;        /*keeps total of all revenues*/

			/*displays info to user*/
			printf("customer: %d  price: %6.3f  gallons: %6.1f  total: %6.2f \n", counter, regular, gallons, total);
			printf("\n");
			break;

		case 2:   /*plus gas*/
			printf("Please enter the number of gallons purchased (between 1/2 and 30): ");
			scanf("%lf", &gallons);
			printf("\n");

			
			/*loop used to prevent invalid input*/
			while (gallons< 0.5 || gallons>30.0)
			{
				printf("Please enter the number of gallons purchased (between 1/2 and 30): ");
				scanf("%lf", &gallons);
				printf("\n");
			}

			total= gallons * plus;  /*calulates cost for customer*/
			plusCustomers++;        /*keeps total of plus customers*/
			plusGallons= plusGallons + gallons;  /*keeps total of plus gallons*/
			plusRevenues= plusRevenues + total;  /*keeps total of plus revenues*/
			revenues= revenues + total;          /*keeps total of all revenues*/

            /*displays info to user*/
			printf("customer: %d  price: %6.3f  gallons: %6.1f  total: %6.2f \n", counter, plus, gallons, total);
			printf("\n");
			break;

		case 3:
			printf("Please enter the number of gallons purchased (between 1/2 and 30): ");
			scanf("%lf", &gallons);
			printf("\n");

			
			/*loop used to prevent invalid input*/
			while (gallons< 0.5 || gallons>30.0)
			{
				printf("Please enter the number of gallons purchased (between 1/2 and 30) ");
				scanf("%lf", &gallons);
				printf("\n");
			}

			total= gallons * super;  /*calulates cost for customer*/
			supCustomers++;            /*keeps total of super customers*/
			supGallons= supGallons + gallons;  /*keeps total of super gallons*/
			supRevenues= supRevenues + total;  /*keeps total of super revenues*/
			revenues= revenues + total;        /*keeps total of all revenues*/

            /*displays info to user*/
			printf("customer: %d  price: %6.3f  gallons: %6.1f  total: %6.2f \n", counter, super, gallons, total);
			printf("\n");
			break;
	}
 }
	
    /*displays end results to user with formatting*/
	printf("====================================================================\n");
	printf("\n");
	printf("Totals:\n");
	printf("\t Type of Gas\t #Customers\t Num Gallons\t Revenues\n");
	printf("\t ===========\t ==========\t ===========\t ========\n");
	printf("\t Regular    \t      %d   \t      %6.1f \t   %6.2f\n", regCustomers, regGallons, regRevenues);
	printf("\t Plus       \t      %d   \t      %6.1f \t   %6.2f\n", plusCustomers, plusGallons, plusRevenues);
	printf("\t Super      \t      %d   \t      %6.1f \t   %6.2f\n", supCustomers, supGallons, supRevenues);
	printf("\t            \t           \t            \t ========\n");
	printf("\t            \t           \t            \t   %6.2f\n", revenues);

	return 0;
}