#include <stdio.h>
#include <conio.h>

int Intro()
{
	printf("\n\n\n\n\n\n============================================================\n");
	printf("        GDQ\n");
	printf("                                        vr. test\n");
	printf("------------------------------------------------------------\n");
	printf("Hi!\n");
	printf("This program's purpose is\n");
	printf("\"Get the dimension quickly that you needed.\".\n");
	printf("This program is freeware. But don't use with commerce.\n");
	printf("Thank you for use this program.\n");
	printf("\nMade By 0x000(http://www.borlandforum.com)\n");
	printf("============================================================\n");
	printf("\n\nPress any key to continue..\n");
	getch();
}

void main()
{
	Intro();
	Select10();
	printf("Thank you for using it!");
}

int select10()
{
	printf("\n\n1. Start\n2. Quit\n");
	select11();
}

int select11()
{
	int x;

	printf("\nMoving on that you wanted:");
	scanf("%d", &x);

	switch(x)
	{
		case 1 : select20(); break;
		case 2 : break;
		default : printf("You inputed another number. Try again."); select11(); break;
	}
}

int select20()
{
	printf("\n\n\n1. Triangle\n2. Quadrangle\n3. Back\n");
	select21();
}

int select21()
{
	int x;

	printf("\nMoving on that you wanted:");
	scanf("%d", &x);

	switch(x)
	{
		case 1 : Tri10(); break;
		case 2 : Qua10(); break;
		case 3 : select10(); break;
		default : printf("You inputed another number. Try again."); select21(); break;
	}
}

int Tri10()
{
	printf("\n\nInput the width and the length in a row(cm):");
	Tri11();
}

int Tri11()
{
	int x,y;

	scanf("%d", &x);
	scanf("%d", &y);

	printf("\nThis number is result that you wanted is..\n");
	printf("%dcm", (x*y)/2);
	Tri12();
}

int Tri12()
{
	printf("\n\n1. Try again\n2. Back");
	Tri13();
}

int Tri13()
{
	int x;

	printf("\n\nMoving on that you wanted:");
	scanf("%d", &x);

	switch(x)
	{
		case 1 : Tri10(); break;
		case 2 : select20(); break;
		default : printf("You inputed another number. Try again."); Tri13(); break;
	}
}

int Qua10()
{
	printf("\n\nInput the width and the length in a row(cm):");
	Qua11();
}

int Qua11()
{
	int x,y;

	scanf("%d", &x);
	scanf("%d", &y);

	printf("\nThis number is result that you wanted is..\n");
	printf("%dcm", x*y);
	Qua12();
}

int Qua12()
{
	printf("\n\n1. Try again\n2. Back");
	Qua13();
}

int Qua13()
{
	int x;

	printf("\n\nMoving on that you wanted:");
	scanf("%d", &x);

	switch(x)
	{
		case 1 : Qua10(); break;
		case 2 : select20(); break;
		default : printf("You inputed another number. Try again."); Qua13(); break;
	}
}