/* http://www.mrwadlo.com */

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

int main()
{
	int i,j;
	char com;
	int num1[78];
	int num2[78];
	int ans[79];
        int hidezeros;

	do {
                clrscr();

		for ( i=0 ; i<77 ; i++ )
		{
			num1[i] = -1;
			num2[i] = -1;
			ans[i]  = 0;
		}
		ans[i] = 0;

                gotoxy(2,2);
		printf("Enter first number:\n ");

		i = 0;
		do {
			
			com = getch();

			if ( com >= '0' && com <= '9' && i <= 76)
			{
				for ( j=0 ; j<76 ; j++ )
					num1[j] = num1[j+1];

				num1[76] = com - '0';

				gotoxy(3,3);

                                for ( j=0 ; j<=76 ; j++ )
				{
					if ( num1[j] >= 0 )
						printf("%d",num1[j]);
					else
						printf(" ");
				}
				i++;
			}
		} while ( com != 13 );
                
		gotoxy(2,4);
		printf("Enter second number:\n ");

		i = 0;
		do {

			com = getch();

			if ( com >= '0' && com <= '9' && i <= 76)
			{
				for ( j=0 ; j<76 ; j++ )
					num2[j] = num2[j+1];

				num2[76] = com - '0';

				gotoxy(3,5);

				for ( j=0 ; j<=76 ; j++ )
				{
					if ( num2[j] >= 0 )
						printf("%d",num2[j]);
					else
						printf(" ");
				}


				i++;
			}

		} while ( com != 13 );

		for ( i=76 ; i>=0 ; i-- )
		{
                        if ( num1[i] > 0 )
				ans[i+1] += num1[i];
			if ( num2[i] > 0 )
				ans[i+1] += num2[i];

			if ( ans[i+1] > 9 )
			{
				ans[i+1] = ans[i+1] - 10;
				ans[i]++;
                        }
		}

		gotoxy(2,6);
		printf("Answer is:\n ");

                hidezeros = 1;

		for ( j=0 ; j<=77 ; j++ )
		{
			if ( hidezeros == 1 && ( ans[j] != 0 || j == 77 ) )
				hidezeros = 0;

			if ( hidezeros == 1 )
				printf(" ");
			else
				printf("%d",ans[j]);
		}
                

        	do {
			printf("\n Would you like to add two more?");
                	com = getch();
		} while ( com != 'y' && com != 'Y' && com != 'n' && com != 'N' );

        } while ( com == 'y' || com == 'Y' );

	return 0;
}