#include "libepc.h"

typedef long long int INT64 ;

typedef struct TESTCASE
	{
	INT64	multiplier ;
	INT64	multiplicand ;
	} TESTCASE ;

INT64	Product(INT64, INT64) ;
void	PutINT64(INT64) ;

int main()
	{
	static TESTCASE tc[] =
		{
		{+12345678ll, +90123456ll},
		{+78901234ll, -56789012ll},
		{-34567890ll, +13579024ll},
		{-68135790ll, -24681357ll}
		} ;
	int i, row, col ;

	ClearScreen(0x07) ;
	
	row = 5 ; col = 18 ;
	for (i = 0; i < ENTRIES(tc); i++)
		{
		INT64 multiplier, multiplicand, gccs, mine ;

		multiplier = tc[i].multiplier ;
		multiplicand = tc[i].multiplicand ;

		gccs = multiplier * multiplicand ;
		mine = Product(multiplier, multiplicand) ;

		SetCursorPosition(row++, col) ;
		PutString("Case #") ;
		PutUnsigned(i, 10, 0) ;
		PutString(": ") ;
		PutINT64(multiplier) ;
		PutString(" * ") ;
		PutINT64(multiplicand) ;

		SetCursorPosition(row++, col) ;
		PutString("gcc's Answer: ") ;
		PutINT64(gccs) ;

		SetCursorPosition(row++, col) ;
		PutString("   My Answer: ") ;
		PutINT64(mine) ;
		if (mine == gccs) PutString("  CORRECT!") ;
		else PutString("  Oops! Try again.") ;

		row++ ;
		}

	return 0 ;
	}

void PutINT64(INT64 a)
	{
	if (a == 0x8000000000000000ll)
		{
		PutString("-9223372036854775808") ;
		return ;
		}

	if (a < 0)
		{
		PutChar('-') ;
		a = -a ;
		}

	if (a >= 10) PutINT64(a / 10) ;
	PutChar('0' + (char) (a % 10)) ;
	}