Page 481 - ComputerScience_Class_11

12.5.1 Evaluation of the Expressions Involving the Operators
An expression in Python is a combination of variables, constants and operators that produces a value. When an expression
contains more than one operator, Python evaluates it according to operator precedence and associativity rules.
Operator precedence decides which operator is evaluated first, while associativity decides the direction of evaluation
(left to right or right to left) when operators have the same precedence.
Program 15: To demonstrate operator precedence in Python.

Program 15.py

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# Arithmetic operators with precedence
result1 = 10 + 5 * 2
# First multiplication (5 * 2 = 10)
# Then addition (10 + 10 = 20)

# Using parentheses to change precedence
result2 = (10 + 5) * 2
# First parentheses (10 + 5 = 15)
# Then multiplication (15 * 2 = 30)

# Exponentiation (right to left associativity)
result3 = 2 ** 3 ** 2
# First 3 ** 2 = 9
# Then 2 ** 9 = 512

# Floor division and modulus
result4 = 17 // 3 + 17 % 3
# Floor division (17 // 3 = 5)
# Modulus (17 % 3 = 2)
# Then addition (5 + 2 = 7)

# Comparison and logical operators
result5 = 8 > 4 and 6 < 3
# 8 > 4 → True
# 6 < 3 → False
# True and False → False

# Complex expression combining multiple operators
result6 = (6 + 2) * 3 - 4 / 2
# Parentheses (6 + 2 = 8)
# Multiplication (8 * 3 = 24)
# Division (4 / 2 = 2)
# Subtraction (24 - 2 = 22)

# Displaying all results
print("Result 1:", result1)
print("Result 2:", result2)
print("Result 3:", result3)
print("Result 4:", result4)
print("Result 5:", result5)
print("Result 6:", result6)

Operators and Expressions 479