#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
 
float tax_cal(float gross_pay);
float pay_cal(float payrate, int worked_hours);
 
void main()
{
	//Variable declaration
	int payrate_index, worked_hours;
	float payrate,gross_pay, tax, net_pay;
 
 
	//Displaying the menu
	printf("\n");
	printf("***********************************************************\n");
	printf("* Enter the number corresponding to the desired pay rate: *\n");
	printf("* 1 - £8.50/hr		2 - £9.90/hr                      *\n");
	printf("* 3 - £22.40/hr		4 - £30.00/hr                     *\n");
	printf("* 0 - Exit the program		                          *\n");
	printf("***********************************************************\n");
 
	restart:
 
	scanf("%d", &payrate_index);
	printf("\nPlease enter the number of hours per week - ");
	scanf("%d", &worked_hours);
 
 
 
	switch(payrate_index)
	{
		case 0:
			exit(0);
 
		case 1:
			payrate = 8.50;
			gross_pay = pay_cal(payrate, worked_hours);
			tax = tax_cal(gross_pay);
			net_pay = gross_pay - tax;
			printf("Net Pay - %.2f", net_pay);
			break;
 
		/*case 2:
			payrate = 9.90;
			gross_pay = pay_cal(payrate, worked_hours);
			tax = taxcal(gross_pay);
			net_pay = gross_pay - tax;
			printf("Net Pay - %.2f", net_pay);
			break;
 
		case 3:
			payrate = 22.40;
			gross_pay = pay_cal(payrate, worked_hours);
			tax = taxcal(gross_pay);
			net_pay = gross_pay - tax;
			printf("Net Pay - %.2f", net_pay);
			break;
 
		case 4:
			payrate = 30.00;
			gross_pay = pay_cal(payrate, worked_hours);
			tax = taxcal(gross_pay);
			net_pay = gross_pay - tax;
			printf("Net Pay - %.2f", net_pay);
			break;
		  */
		default :
			printf("Please select the number from the menu [1-4]\n");
			goto restart;
 
	}
 
}
 
float pay_cal(float payrate, int worked_hours)
{
	int normal_hours = 38;
	float gross_pay;
	float overtime_wage = 0.0;
 
	if (worked_hours > normal_hours)
		overtime_wage = (float)(worked_hours - normal_hours ) * payrate * 1.5;
 
	gross_pay = (float)(worked_hours * payrate) + overtime_wage;
	printf("\nGross Pay - %.2f", gross_pay);
	return gross_pay;
}
 
float tax_cal(float gross_pay)
{
	/*Tax rates: 	15% of the first £300
						20% of the next £200
						25% of the next £150
						30% of the rest
  */
	float tax,tax1,tax2,tax3,tax4;
	if(gross_pay <= 300.0 && gross_pay > 8.5)
	{
		tax = 0.15*gross_pay;
	}
	else if(gross_pay>=301.0 && gross_pay <= 500.0)
	{
		tax1 = 0.15 * 300.0;
		tax2 = 0.2  * (gross_pay - 300.0);
		tax  = tax1 + tax2;
	}
	else if(gross_pay>=501.0 && gross_pay <= 650.0)
	{
		tax1 = 0.15 * 300.0;
		tax2 = 0.2  * (500.0 - 300.0);
		tax3 = 0.25 * (650.0 - 500.0);
		tax  = tax1 + tax2 + tax3;
	}
	else
	{
		tax1 = 0.15 * 300.0;
		tax2 = 0.2  * (500.0 - 300.0);
		tax3 = 0.25 * (650.0 - 500.0);
		tax4 = 0.3	*	(gross_pay - 650.0);
		tax  = tax1 + tax2 + tax3 + tax4;
	}
	printf("\nPayable Tax - %.2f", tax);
	return tax;
}