Chapter 2 Decision Making (Python Programming Lecture)

PYTHON
PROGRAMMING
Chapter 2
Decision Making

Topic
• Decision Making (Conditional Statement)
• Operator
• Comparisons Operator
• Logical Operator
• Bitwise Operator

PYTHON
PROGRAMMING
Chapter 2
Lecture 2.1
Conditional Statement

Conditional Statement Syntax
if condition:
#statement
if condition:
#statement1
else:
#statement2
if condition:
#statement1
elif condition:
#statement2
else:
#statement3

PYTHON
PROGRAMMING
Chapter 2
Lecture 2.1.1
Comparison Operator in

Comparison Operator in Python
Operation Operator
Less Than <
Less Than or Equal <=
Greater Than >
Greater Than or Equal >=
Equality ==
Not Equal !=

• 5>2 return True
• 3>5 return False
• 4>4 return False
• 5>=2 return True
• 3>=5 return False
• 4>=4 return True
• 3<5 return True
• 8<5 return False
• 4<4 return False
• 3<=5 return True
• 8<=5 return False
• 4<=4 return True

• 5==5 return True
• 5==3 return False
• 4==6 return False
• 5!=5 return False
• 5!=3 return True
• 4!=6 return True

Find Pass/ Fail
mark = int(input())
if mark>=33:
print("Pass")
else:
print("Fail")

Find Voter or Not Voter
age = int(input())
if age>=18:
print("Voter")
else:
print("Not Voter")

Is a number Positive/ Negative/ Zero?
num = int(input())
if num>0:
print("Positive")
elif num<0:
print("Negative")
else:
print("Zero")

Find Grade of Exam
mark = int(input())
if mark>=80:
print("A+")
elif mark>=70:
print("A")
elif mark>=60:
print("B")
elif mark>=50:
print("C")
elif mark>=40:
print(“D")
elif mark>=33:
print("E")
else:
print("F")

Find Maximum between 2 number.
a = int(input())
b = int(input())
if a>b:
print(a)
else:
print(b)

Find Maximum between 2 number. (*)
a = int(input())
b = int(input())
maximum = max(a, b)
print("{} is maximum".format(maximum))

Find Minimum between 2 number.
a = int(input())
b = int(input())
if a<b:
print(a)
else:
print(b)

Check is a number EVEN or ODD.
num = int(input())
if num%2==0:
print("Even")
else:
print("Odd")

Practice Problem 2.1
1. Find Pass/ Fail.
2. Find Voter or Not Voter.
3. Is a number Positive/ Negative/ Zero?
4. Find Grade of Exam.
5. Find Maximum between 2 number.
6. Find Minimum between 2 number.
7. Check is a number EVEN or ODD.

Any Question?
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PYTHON
PROGRAMMING
Chapter 2
Lecture 2.2
Logical Operator in

Logical Operator in Python
Operation Operator
Logical And and
Logical Or or
Logical Not not

Logical Operator in Python (NOT)
Value not
True False
False True

Logical Operator in Python (AND)
Value 1 Value 2 and
False False False
False True False
True False False
True True True

Logical Operator in Python (OR)
Value 1 Value 2 or
False False False
False True True
True False True
True True True

Find Maximum between 3 number.
a = int(input())
b = int(input())
c = int(input())
if a>b and a>c:
print(a)
elif b>a and b>c:
print(b)
else:
print(c)

Find Minimum between 3 number.
a = int(input())
b = int(input())
c = int(input())
if a<b and a<c:
print(a)
elif b<a and b<c:
print(b)
else:
print(c)

Check is a year Leap Year or Not.
year = int(input())
if year%400==0:
print("Leap Year")
elif year%100==0:
print("Not Leap Year")
elif year%4==0:
print("Leap Year")
else:

Check is a year Leap Year or Not. [2]
year = int(input())
if year%400==0 or year%100!=0 and year%4 == 0:
print("Leap Year")
else:

1. Find Maximum between 3 number.
2. Find Minimum between 3 number.
3. Check is a year Leap Year or Not.
4. Check is a year with Logical Operator in Single if statement.

PYTHON
PROGRAMMING
Chapter 1
Lecture 1.2
Arithmetic Operation Example

Bitwise Operator
• (~) complement
• (&) bitwise and
• (|) bitwise or
• (^) bitwise exclusive or (xor)
• (<<) left shift
• (>>) right shift
• (~) complement

Bitwise Operator in Python (AND)
Bit 1 Bit 2 AND (&)
0 0 0
0 1 0
1 0 0
1 1 1

Bitwise Operator in Python (OR)
Bit 1 Bit 2 OR (|)
False 00 0
0 1 1
1 0 1
1 1 1

Check EVEN or ODD with Bitwise Ope[1].
num = int(input())
if num&1 == 0:
print("Even")
else:
print("Odd")
Bit Level Operation
30 & 1 = 00011110 & 00000001 = 00000000 = 0 (Even)
45 & 1 = 000101101 & 00000001 = 00000001 = 1 (Odd)

Use of Left Shift Operator
a = int(input())
b = int(input())
print(a<<b)
Left Shift Operation Example
1<<3 = 00000001<<3 = 00001000 = 8
2<<2 = 00000010<<3 = 00001000 = 8
3<<3 = 00000011<<3 = 00011000 = 24
13<<4 = 00001101<<3 = 11010000 = 208

Use of Right Shift Operator
a = int(input())
b = int(input())
print(a>>b)
Right Shift Operation Example
13>>2 = 00001101>>2 = 00000011 = 3
208>>2 = 11010000>>2 = 00110100 = 52
72>>3 = 01001000>>3 = 00001001 = 9
87>>4 = 01010111>>3 = 00000101 = 5

Test nth Bit of a number is Set or Not?
a = int(input())
n = int(input())
b = 1<<(n-1) #Set nth bit
if a&b==0: # Test nth bit
print("Bit is Not Set")
else:
print("Bit is Set")
Nth Bit Set or Not Operation Example 1
a = 13 = 00001101
n = 4
b = 1<<(n-1) = 1<<(4-1) = 1<<3
b = 000000001<<3 = 00001000
a & b = 00001101 & 00001000 = 00001000 = 8
Nth Bit Set or Not Operation Example 2
a = 13 = 00001101
n = 2
b = 1<<(n-1) = 1<<(2-1) = 1<<1
b = 000000001<<3 = 00000010
a & b = 00001101 & 00000010 = 00000000 = 0

Set nth Bit of a number
a = int(input())
n = int(input())
b = 1<<(n-1) #Set nth bit
c = a | b
print(c)
print(bin(c))
Set nth Bit of a number Example 1
a = 13 = 00001101
n = 4
b = 1<<(n-1) = 1<<(4-1) = 1<<3
b = 000000001<<3 = 00001000
a | b = 00001101 | 00001000 = 00001101 = 13
a = 13 = 00001101
n = 2
b = 1<<(n-1) = 1<<(2-1) = 1<<1
b = 000000001<<3 = 00000010
a | b = 00001101 | 00000010 = 00001111 = 15

Unset nth Bit of a number
a = int(input())
n = int(input())
s = 1<<n-1
c = a & ~s
print(f"{a:08b}")
print(f"{c:08b}")
a = 13 = 00001101
n = 4
s = 1<<n-1 = 00000001<<3 = 00001000
~s = ~00001000 = 11110111
c = a & ~s 00001101 & 11110111 = 00000101

1. Check is a number EVEN or ODD using Bitwise Operator.
2. Test nth Bit of a number is Set or Not?
3. Set nth Bit of a number
4. Unset nth Bit of a number

Chapter 2 Decision Making (Python Programming Lecture)

Chapter 2 Decision Making (Python Programming Lecture)

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