a common cathode seven segment display library

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Now that you've posted that I'll post this one; compiles but otherwise untested.

#define ENTRY_COUNT(ARRAY)  (sizeof(ARRAY) / sizeof(ARRAY[0]))

class digit_t
{
    union {
        uint8_t _pins[7];
        struct  { uint8_t _A, _B, _C, _D, _E, _F, _G; };
    };

    digit_t();

public:
    digit_t(uint8_t pinA, uint8_t pinB, uint8_t pinC, uint8_t pinD, uint8_t pinE, uint8_t pinF, uint8_t pinG)
        : _A(pinA), _B(pinB), _C(pinC), _D(pinD), _E(pinE), _F(pinF), _G(pinG)
    {
        for ( int i = ENTRY_COUNT(_pins); i--; )
        {
            pinMode(_pins[i], OUTPUT);
        }
    }

    void display(uint8_t const value)
    {
        const uint8_t   segments[] =
        {
          //     ABCDEFG
              0b01111110    // 0
            , 0b00110000    // 1
            , 0b01101101    // 2
            , 0b01111001    // 3
            , 0b00110011    // 4
            , 0b01011011    // 5
            , 0b01011111    // 6
            , 0b01110000    // 7
            , 0b01111111    // 8
            , 0b01110011    // 9
        };

        for ( uint8_t mask = 0b01000000, i = 0; mask; mask>>= 1, i++ )
        {
            digitalWrite(_pins[i], ((segments[value] & mask) ? HIGH : LOW));
        }
    }
};

digit_t     digit(13, 12, 11, 10, 9, 8, 7);

void loop()
{
    int     value;
    value = analogRead(0);
    value = map(value, 0, 1023, 0, 9);  // remap the sensor readings to 0-9
    digit.display(value);               // display the sensor readings on seven segment display
}

void setup()
{}