/* Seven Segment Indicators (Letters) (15 pt)

Seven Segment indicators are commonly used to display numbers 0-9.
It is possible, however, to represent some letters as well. For example 
the first six letters of the English alphabet that are also used in the 
hexadecimal number system can be displayed as:
	
 _       _        _   _
|_| |_  |    _|  |_  |_
| | |_| |_  |_|  |_  |


Write a complete C program that generates two random letters in the 
range [A .. F] and prints them on the screen using an ASCII encoding of 
their seven-segment indicator representation (as shown in the sample 
runs given below). The program must come up with a different pair of 
letters every time you run it. It is OK if during some (but not all) 
runs the two random letters are the same.


SAMPLE RUN #1:
 _	 _   
|_| |_
| | |

SAMPLE RUN #2:
 _
|_   _|
|_  |_|

SAMPLE RUN #3:
 _
|   |_
|_  |_|


*/


#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main()
{

char number[10][3][3]=	{     	/* A */
							{{' ', '_', ' '},
							 {'|', '_', '|'},
							 {'|', ' ', '|'}},  

								/* B */
							{{' ', ' ', ' '},
							 {'|', '_', ' '},
							 {'|', '_', '|'}},  

								/* C */
							{{' ', '_', ' '},
							 {'|', ' ', ' '},
							 {'|', '_', ' '}},  

								/* D */
							{{' ', ' ', ' '},
							 {' ', '_', '|'},
							 {'|', '_', '|'}},  

								/* E */
							{{' ', '_', ' '},
							 {'|', '_', ' '},
							 {'|', '_', ' '}},  

								/* F */
							{{' ', '_', ' '},
							 {'|', '_', ' '},
							 {'|', ' ', ' '}},  
					};

	int i,j,k;

	int n1, n2;

	srand ( time(NULL) );  // initialize the random number generator
	n1 = rand()%6;         // generate a random number [0..5]
	n2 = rand()%6;         // generate a second random number
	
	// print the two side by side
	for(i=0; i<3; i++)
	{
		for(j=0; j<3; j++)
			printf("%c", number[n1][i][j]);

		printf(" ");
		
		for(j=0; j<3; j++)
			printf("%c", number[n2][i][j]);

		printf("\n");
	}		

	printf("\n");
	system("pause");
}