Displaying a number in the 7-segment display is done by letting the appropriate LED's to light. Say for example we want to display no. 4 to the display. Basing from the connection of above, we must output bits that will cause the segments that are connected to D0, D4, D6, and D3 to light. So, these will be the bits that we are going to ouput: D7 is not included in the circuit but we still have to output a bit to it. So, we just put there zero so that the binary number will be easily converted to hexadecimal. A seven-segment and four push buttons, Pb1 to Pb4, are interfaced to D0 to D6 and S4 to S7 respectively. Write a program that will interpret the pressing of the push-buttons as binary inputs and then display the equivalent decimal to the seven-segment display. Binary 1 must mean Pb is pressed.