Question

[Using Python]

Write a program to convert a hexadecimal number to its decimal value using the ord builtin function

(Reminder: hexadecimal numbers are 0 through 9, A,B,C,D,E,F. hex(A) = 10, hex(F) = 15).

example outputs:

1. `Enter a hex number: f`

`The decimal value for hex number f is 15`

2. `Enter a hex number: g`

`Incorrect hex number`

3. `Enter a hex number: 091c`

`The decimal value for hex number 091c is 2332`

4. `Enter a hex number: 091g`

`Incorrect hex number`

Hints:

• you need to use the ord builtin function
• you need to iterate through the input hex number using a loop, referencing the index of each hex character
• you need to convert the input hex number to upper case
• Make sure there is a invalid response for invalid input.

Answer 1

Ans:

# The required program using builtin ordered function is as follows:

def hexToDec(hexi):
result = 0;

for ch in hexi:
if 'A' <= ch <= 'F' or 'a' <= ch <= 'f':
if 'a' <= ch <= 'f':
result = result * 16 + ord(ch) - ord('a') + 10
else:
result = result * 16 + ord(ch) - ord('A') + 10
  
elif 'G' <= ch <= 'Z' or 'g' <= ch <= 'z':
return "Incorrect hex number"
  
else:
result = result * 16 + ord(ch) - ord('0')

return "The decimal value for hex number {} is {}".format(hexi,result)
  
print(hexToDec(input("Enter a hex number: ")))
print(hexToDec(input("Enter a hex number: ")))
print(hexToDec(input("Enter a hex number: ")))
print(hexToDec(input("Enter a hex number: ")))

# Desired OUTPUT is as follows:

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# THANK YOU SO MUCH IN ADVANCE!