38 lines
749 B
C
38 lines
749 B
C
#include <stdio.h>
|
|
|
|
int key_to_index(key)
|
|
char key;
|
|
{
|
|
if ( key >= '0' && key <= '9' )
|
|
return (int)(key - '0');
|
|
else if ( key >= 'a' && key <= 'c' )
|
|
return (int)(key - 'a') + 10;
|
|
else if ( key >= 'e' && key <= 'f' )
|
|
return (int)(key - 'e') + 13;
|
|
else return -100;
|
|
}
|
|
|
|
char index_to_key(index)
|
|
int index;
|
|
{
|
|
if ( index >= 0 && index <= 9 )
|
|
return (char)(index + '0');
|
|
else if ( index >= 10 && index <= 12 )
|
|
return (char)(index - 10 + 'a');
|
|
else if ( index >= 13 && index <= 14 )
|
|
return (int)(index - 13 + 'e');
|
|
else
|
|
/* huh? */
|
|
return '?';
|
|
}
|
|
|
|
main()
|
|
{
|
|
int i;
|
|
for ( i=0; i<16; i++ )
|
|
{
|
|
printf( "%d ==> %c:%d\n",
|
|
i, index_to_key(i), key_to_index(index_to_key(i)) );
|
|
}
|
|
}
|