Answered: I need help annotating this code. def…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

I need help annotating this code.

def OR(a, b):
if a == 1:
return 1
elif b == 1:
return 1
else:
return 0

def NOR(a, b):
if a == 0 and b == 0:
return 1
elif a == 0 and b == 1:
return 0
elif a == 1 and b == 0:
return 0
elif a == 1 and b == 1:
return 0

def AND(a, b):
if a == 1 and b == 1:
return 1
else:
return 0

def logic_circuit(A,B,C):
Q = OR(NOR(A,B),AND(B,C))
return(Q)

A = int(input("Enter binary input For A: "))
B = int(input("Enter binary input For B: "))
C = int(input("Enter binary input For C: "))
Q = logic_circuit(A, B, C)
print("Output: ", Q)

Expert Solution

Step 1

The annotations in Python are provided in 4 different manners:

Annotations for simple parameters
- def foobar(a: expression, b: expression = 5):
Annotations for excess parameters
- def foobar(*args: expression, *kwargs: expression):
Annotations for nested parameters
- def foobar((a: expression, b: expression), (c: expression, d: expression)):
Annotations for return type
- def foobar(a: expression)->expression:

Step 2

# User defined function for logic OR
# The function takes two parameters and returns a single int
def OR(a: int, b: int)->int:
    # If a is equal to 1 return 1
    if a == 1 :
        return 1
    # If b is equal to 1 return 1
    elif b == 1 :
        return 1
    # If a and b is equal to 0 return 0
    else :
        return 0


# User defined function for logic NOR
# The function takes two parameters and returns a single int
def NOR(a: int, b: int)->int:
    # If a is equal to 0 and b is also equal to 0 return 1
    if a == 0 and b == 0 :
        return 1
    # If a is equal to 0 and b is equal to 1 return 0
    elif a == 0 and b == 1 :
        return 0
    # If a is equal to 1 and b is also equal to 0 return 0
    elif a == 1 and b == 0 :
        return 0
    # If a is equal to 1 and b is also equal to 1 return 0
    elif a == 1 and b == 1 :
        return 0


# User defined function for logic AND
# The function takes two parameters and returns a single int
def AND(a: int, b: int)->int:
    # Return 1 if both a and b are equal to 1
    if a == 1 and b == 1 :
        return 1
    # Return 0 otherwise
    else :
        return 0


# User defined function for defining a logical circuit
# The function takes three parameters and returns a single int
def logic_circuit(A: int, B: int, C: int)->int:
    # Calling above defined functions with
    # parameters passed to them
    # The function calls simulate a logic circuit
    # The result is stored in a variable Q
    # The value in Q is returned
    Q = OR(NOR(A, B), AND(B, C))
    return Q


# User inputs for bits A, B and C
A = int(input("Enter binary input For A: "))
B = int(input("Enter binary input For B: "))
C = int(input("Enter binary input For C: "))

# Calling function logic_circuit with A, B and C
# passed as parameters
# The result is stored in a variable Q
# The value of Q is returned
Q = logic_circuit(A, B, C)
print("Output: ", Q)

NOTE:

The definition for NOR(a, b) can be changed as follows:

# User defined function for logic NOR
# The function takes two parameters and returns a single int
def NOR(a: int, b: int)->int:
    # If a is equal to 0 and b is also equal to 0 return 1
    if a == 0 and b == 0 :
        return 1
    # Return 0 for all other value combination of a and b
    else:
        return 0

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