void main (void)
{
            unsigned int COUNTER = 0;
            TRISB = 0b11110000;                                  // Set the four least significant bits as output, and
                                                                        // the four most significant bits as input.
            PORTB = 0b00000000;                               // Output bits take a logical 0.
            while (1)                                                          // Loop forever
            {
                        if (PORTB.F7 == 0)                          // Evaluates if RB7 bit is 0
                        {
                                    if (PORTB.F0 == 1)              // Evaluates RB0 bit value and switches its value.
                                                PORTB.F0 = 0;
                                    else
                                                PORTB.F0 = 1;
                                    while (PORTB.F7 == 0);      // Wait for the RB7 change to 1.
                        }
                        COUNTER ++;                                 // Increase the counter value.
                        // The following if condition automatically changes the status of bit RB1
                        if (COUNTER & 0x0100)                // Evaluates if bit 8 of count is 1
                                    PORTB.F1 = 1;
                        else
                                    PORTB.F1 = 0;
            }
}