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