[Using Python]
Write a program to convert a hexadecimal number to its decimal value.
(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:
# function to convert the hexadecimal number to its decimal equivalent
def hex_to_decimal(hex_num):
# dictonary to tell the value of hex num
hex = {'0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9, 'A': 10, 'B': 11, 'C': 12, 'D': 13, 'E': 14, 'F': 15}
# creating list of chars and reversing it
hex_num = hex_num.upper()
chars = list(hex_num)
chars.reverse()
decimal = 0
# looping through each char and adding to result
for i in range(len(chars)):
# if invalid input
if chars[i] not in hex:
return -1
else:
decimal += hex[chars[i]] * (16 ** i)
print()
# return the decimal value
return decimal
# driver code
if __name__ == "__main__":
hex_num = input('Enter a hex number: ')
if hex_to_decimal(hex_num) == -1:
print('Incorrect hex number')
else:
print('The decimal value for hex number {} is {}'.format(hex_num, hex_to_decimal(hex_num)))
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