#include <stdio.h>
#include <math.h>

#define DOLLARS_TO_DOUGHNUTS 12

void menu(void);
void drawFace(void);
void convertTemp(void);
void quadrant(void);
void doughnuts(void);

int main()
{
	
	int task;
	
	
	
	do
	{
		menu();
		scanf("%d", &task);
		switch (task)
		{
			case 0:			
				printf("\n Thank you for running this program, have a nice 
day!!\n");
				break;	
			case 1:
				drawFace();
				break;
			case 2:
				convertTemp();
				break;
			case 3:
				quadrant();
				break;
			case 4:
				doughnuts();
				break;
			default:
				printf("\n That is not a valid task number !*!!#*!");	
		}
	
	}while( task !=0 );
			
	return 0;
}

void doughnuts(void)
{

	int dollars;
	int doughnuts;
	
	printf("Enter number of whole dollars => ");
	scanf("%d", &dollars);
	
	if( dollars >= 20 )
	{
		printf("\n You qualify for the Super Bakers dozen rate,");
		printf(" %d doughnuts per dollar", ( DOLLARS_TO_DOUGHNUTS + 3 ));
		doughnuts = ( DOLLARS_TO_DOUGHNUTS + 3 ) * dollars;
	}
	else if ( dollars >= 10 )
	{
	printf("\n You qualify for the Bakers dozen rate, %d doughnuts per dollar", ( 
DOLLARS_TO_DOUGHNUTS + 1 ));
		doughnuts = ( DOLLARS_TO_DOUGHNUTS + 1 ) * dollars;
	}
	else	/* default case  */
	{	
		printf("\n Your rate is %d doughnuts per dollar", DOLLARS_TO_DOUGHNUTS);
		doughnuts = dollars * DOLLARS_TO_DOUGHNUTS;
	}	
	
	printf("\n%d dollars can buy you %d doughnuts!\n", dollars, doughnuts);		
}

void quadrant(void)
{	
	double x;
	double y;
	printf("\n Enter x => ");	
	scanf("%lf",&x);
	printf("\n Enter y => ");	
	scanf("%lf",&y);
	if ( x == 0.0 )
	{
		if ( y == 0.0 )
			printf("\nPoint (%.2f,%.2f) is on origin", x, y);
		else if (y > 0.0)
			printf("\nPoint (%.2f,%.2f) is on positive y-axis", x, y);
		else 
			printf("\nPoint (%.2f,%.2f) is on negative y-axis", x, y);
	}
	else if ( x > 0.0 )
	{
		if ( y == 0.0 )
			printf("\nPoint (%.2f,%.2f) is on positive x-axis", x, y);
		else if (y > 0.0)
			printf("\nPoint (%.2f,%.2f) is in QI", x, y);
		else 
			printf("\nPoint (%.2f,%.2f) is in QIV", x, y);
	}
	else
	{
		if ( y == 0.0 )
			printf("\nPoint (%.2f,%.2f) is on negative x-axis", x, y);
		else if (y > 0.0)
			printf("\nPoint (%.2f,%.2f) is in QII", x, y);
		else 
			printf("\nPoint (%.2f,%.2f) is in QIII", x, y);
	}
}



void  convertTemp(void)
{
	double tempF;
	double tempC;
	printf("\n Enter Fahrenheit Temperature => ");	
	scanf("%lf",&tempF);
	tempC = ((tempF-32)/9)*5;	
	printf("\n %.2f degrees Fhrenheit = %.2f degrees Celsius\n", tempF, tempC);
}

void menu()
{
	printf("\n##############################################################");
	printf("\n##############################################################");
	printf("\nEnter the number corresponding to the the task you wish done:");
	printf("\n##############################################################\n");
	printf("\n\t0) Exit program");
	printf("\n\t1) Draw face");
	printf("\n\t2) Convert temperatures");
	printf("\n\t3) Quadrant question");
	printf("\n\t4) Calculate doughnuts\n");
	printf("\n##############################################################\n\n\t");
	
}


void drawFace()
{
	printf("\n\t    xxxxx"     );
	printf("\n\t x         x"  );
	printf("\n\tx   () ()   x" );
	printf("\n\tx           x" );
	printf("\n\tx   \\___/   x");
	printf("\n\t x         x"  );
	printf("\n\t    xxxxx"     );
	printf("\n\n      Have a good Day!!!\n\n\n");
}