Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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python code. Instructions are given below for each function. Run function is already done. 

1) def num_to_digit_rec(num, base):
"""
Return a list of digits for num with given base;
Return an empty list [] if base < 2 or num <= 0
"""
# Write your code here
return []
 
2) def digit_sum(num, base):
"""
Return the sum of all digits for a num with given base
Your implementation should use num_to_digit_rec() function
"""
# Write your code here
return 0
 
3) def digit_str(num, base):
"""
Given a number and a base, for base between [2, 36] inclusive
Converts the number to its string representation using digits
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
to represent digits 0 to 35.
Return the string representation of the number
Return an empty string '' if base is not between [2, 36]
Your implementation should use num_to_digit_rec() function
"""
digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
# Can not find str representations for base not in [2, 36]
if base > 36 or base < 2:
return ""
# Calculate and return the str representation for num for the given base
# Write your code here
return ""
 
4) def digit_to_num(rep, base):
"""
Return -1 if base is not between [2,36] inclusive;
or if the string rep contains characters not a digit for the base;
Return the number represented by the string for the given base otherwise.
For example digit_to_num("1001", 2) is 9; digit_to_num("ABC", 16) is 2748.
"""
# Check if the base is valid
if base > 36 or base < 2:
return -1
digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
rep = rep.upper()
# Check if the rep only uses proper digits
# Write your code here
return 0
 
5) def uses_only(word, letters):
"""
Return True if word only uses characters from letters;
otherwise return False
"""
# Write your code here
return True
6) def run():
num = int(input("Enter a num: "))
base = int(input("Enter a base: "))
print(f"Digit list is {num_to_digit_rec(num, base)}")
print(f"Digit sum is {digit_sum(num, base)}")
print(f"String Rep is {digit_str(num, base)}")
rep = input(f"Enter a string rep of a num with base {base}: ")
print(f"The number is {digit_to_num(rep, base)}")

 

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