/* An Arithmetic Quiz Program */

#include <stdio.h>
#include <conio.h>
#include <math.h>
#include <limits.h>
#include <stdlib.h>
#include <time.h>

void initlize ();
addtest ();
subtest ();
multitest ();
divtest ();

int number [10];

main ()
	{
	clrscr ();
	char choice;
	initlize ();

	while (1 == 1)
		{
		printf ("\n\n\n\t\t\tARITHMATIC QUIZ");
		printf ("\n\n\n\n\n");
		printf ("\t\t\t1 - Addition test\n\n");
		printf ("\t\t\t2 - Subtraction test\n\n");
		printf ("\t\t\t3 - Multiplication test\n\n");
		printf ("\t\t\t4 - Division test\n\n");
		printf ("\t\t\t5 - Quit\n\n");
		printf ("\n\n\n\n\n\t\t\tWHAT IS YOUR CHOICE ? : ");
		scanf ("\n%c", &choice);

		if (choice == '1')
			{
			addtest ();
			}
		else if (choice == '2')
			{
			subtest ();
			}
		else if (choice == '3')
			{
			multitest ();
			}
		else if (choice == '4')
			{
			divtest ();
			}
		else if (choice == '5')
			{
			break;
			}
		else
			{
			printf ("%c", 7);
			}
		}
	}


void initlize ()
	{
	//randomize ();
	//rand (number [10]);
	number [0] = 3;
	number [1] = 5;
	number [2] = 0;
	number [3] = 7;
	number [4] = 9;
	number [5] = 1;
	number [6] = 8;
	number [7] = 4;
	number [8] = 6;
	number [9] = 2;
	}


addtest ()
	{
	int counterA, counterB, difference, answer;
	char again;

	counterA = 0;
	difference = 1;
	counterB = counterA + difference;

	while (1 == 1)
		{
		printf ("\n\n\n\n\n\n\n");
		printf ("\t\t\tADDITION QUIZ");
		printf ("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n");
		printf ("\t%d + %d =  ", number [counterA], number [counterB]);
		scanf ("%d", &answer);

		if (answer == number [counterA] + number [counterB])
			{
			printf ("\nTHAT IS CORRECT!!");
			}
		else
			{
			printf ("\nTHAT IS INCORRECT.\n");
			printf ("\nThe answer is %d", number [counterA] + number [counterB]);
			}
		printf ("\n\nDo you want to try again ? Y/N : ");
		scanf ("\n%c", &again);

		if (again != 'Y' && again != 'y')
			{
			break;
			}
		else
			{
			counterA = counterA + 2;

			if (counterA > 9)
				{
				counterA = counterA - 10;
				difference = difference + 1;
				}

			if (difference > 9)
				{
				difference = 2;
				}
			counterB = counterA + difference;

			if (counterB > 9)
				{
				counterB = counterB - 10;
				}
			}
		}
	return (answer);
	}


subtest ()
	{
	int counterA, counterB, difference, answer;
	char again;

	counterA = 2;
	difference = 3;
	counterB = counterA + difference;

	while (1 == 1)
		{

		if (number [counterA] < number [counterB])
			{
			again = 'Y';
			}
		else
			{
			printf ("\n\n\n\n\n\n\n");
			printf ("\t\t\tSUBTRACTION QUIZ");
			printf ("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n");
			printf ("\t%d - %d = ", number [counterA], number [counterB]);
			scanf ("%d", &answer);

			if (answer == number [counterA] - number [counterB])
				{
				printf ("\nTHAT IS CORRECT!!");
				}
			else
				{
				printf ("\nTHAT IS INCORRECT.\n");
				printf ("\nThe answer is %d", number [counterA] - number [counterB]);
				}
			printf ("\n\nDo you want to try again ? Y/N : ");
			scanf ("\n%c", &again);
			}

		if (again != 'Y' && again != 'y')
			{
			break;
			}
		else
			{
			counterA = counterA + 2;
			counterB = counterA + difference;

			if (counterA > 9)
				{
				counterA = counterA - 10;
				difference = difference + 1;
				}

			if (difference > 9)
				{
				counterB = counterB - 10;
				}

			if (counterB > 9)
				{
				difference = 2;
				}
			}
		}
	return (answer);
	}


multitest ()
	{
	int counterA, counterB, difference, answer;
	char again;

	counterA = 4;
	difference = 5;
	counterB = counterA + difference;

	while (1 == 1)
		{
		printf ("\n\n\n\n\n\n\n");
		printf ("\t\t\tMULTIPLCATION QUIZ");
		printf ("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n");
		printf ("\t%d * %d =  ", number [counterA], number [counterB]);
		scanf ("%d", &answer);

		if (answer == number [counterA] * number [counterB])
			{
			printf ("\nTHAT IS CORRECT!!");
			}
		else
			{
			printf ("\nTHAT IS INCORRECT.\n");
			printf ("\nThe answer is %d", number [counterA] * number [counterB]);
			}
		printf ("\n\nDo you want to try again ? Y/N : ");
		scanf ("\n%c", &again);

		if (again != 'Y' && again != 'y')
			{
			break;
			}
		else
			{
			counterA = counterA + 2;

			if (counterA > 9)
				{
				counterA = counterA - 10;
				difference = difference + 1;
				}

			if (difference > 9)
				{
				difference = 2;
				}
			counterB = counterB + difference;

			if (counterB > 9)
				{
				counterB = counterB - 10;
				}
			}
		}
	return (answer);
	}


divtest ()
	{
	int counterA, counterB, difference, answer, remainder;
	char again;

	counterA = 3;
	difference = 4;
	counterB = counterA + difference;

	while (1 == 1)
		{

		if (number [counterA] < number [counterB] || number [counterB] == 0)
			{
			again = 'Y';
			}
		else
			{
			printf ("\n\n\n\n\n\n\n");
			printf ("\t\t\tDIVISION QUIZ");
			printf ("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n");
			printf ("\t%d / %d =  ", number [counterA], number [counterB]);
			printf ("\nWhat is the answer? : ");
			scanf ("%d", &answer);
			printf ("\nWhat is the remainder? : ");
			scanf ("%d", &remainder);

			if (answer == number [counterA] / number [counterB] && remainder == number [counterA] %	number [counterB])
				{
				printf ("\nTHAT IS CORRECT!!");
				}
			else
				{
				printf ("\nTHAT IS INCORRECT.\n");
				printf ("\nThe answer is %d remainder %d", number [counterA] / number [counterB], number [counterA] % number [counterB]);
				}
			printf ("\n\nDo you want to try again ? Y/N : ");
			scanf ("\n%c", &again);
			}

		if (again != 'Y' && again != 'y')
			{
			break;
			}
		else
			{
			counterA = counterA + 2;

			if (counterA > 9)
				{
				counterA = counterA - 10;
				difference = difference + 1;
				}

			if (difference > 9)
				{
				difference = 2;
				}
			counterB = counterA + difference;

			if (counterB > 9)
				{
				counterB = counterB - 10;
				}
			}
		}
	return (answer, remainder);
	}