Question

To reduce the number of used digital outputs of the microcontroller, the display board is connected to the main board through the integrated circuit of the decoder, which converts binary coded decimal (BCD) values to signals for the seven-segment display. So, to show any number on the display you need to set the required BCD code on the microcontroller's outputs. Write a program to convert an integer number represented as a string to a BCD code required for the display. In the BCD code, every decimal digit is encoded with its four-bit binary value. Encoding all digits of the decimal number and concatenating the resulting codes into one string you will get a resulting BCD code. A space is used to separate digits in the BCD code and make it more readable. For example, a number 173 will be encoded to BCD as 0001 0111 0011.

Answer 1

Answer:

The program in Python is as follows:

BCD = ["0001","0010","0011","0100","0101","0110","0111"]

num = input("Decimal: ")

BCDValue = ""

valid = True

for i in range(len(num)):

   if num[i].isdigit():

       if(int(num[i])>= 0 and int(num[i])<8):

           BCDValue += BCD[i]+" "

       else:

           valid = False

           break;

   else:

       valid = False

       break;

if(valid):

   print(BCDValue)

else:

   print("Invalid")

Explanation:

This initializes the BCD corresponding value of the decimal number to a list

BCD = ["0001","0010","0011","0100","0101","0110","0111"]

This gets input for a decimal number

num = input("Decimal: ")

This initializes the required output (i.e. BCD value)  to an empty string

BCDValue = ""

This initializes valid input to True (Boolean)

valid = True

This iterates through the input string

for i in range(len(num)):

This checks if each character of the string is a number

   if num[i].isdigit():

If yes, it checks if the number ranges from 0 to 7 (inclusive)

       if(int(num[i])>= 0 and int(num[i])<8):

If yes, the corresponding BCD value is calculated

           BCDValue += BCD[i]+" "

       else:

If otherwise, then the input string is invalid and the loop is exited

           valid = False

           break;

If otherwise, then the input string is invalid and the loop is exited

   else:

       valid = False

       break;

If valid is True, then the BCD value is printed

if(valid):

   print(BCDValue)

If otherwise, it prints Invalid

else:

   print("Invalid")