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🌟 Conditional Statements in Python

📜 Syntax

🔍 Click to expand syntax details! 
if condition:  # Executes if the condition is True
    statement1
elif condition:  # Executes if the previous conditions are False, and this one is True
    statement2
else:  # Executes if all conditions are False
    statementN

🔥 Examples

✅ Simple if and else

🔗 Click to view example 
age = 14
if age >= 18:
    print("can vote")
    print("can drive")
else:
    print("can't vote")

Output:

can't vote

🟢 Using elif

🔗 Click to view example 
light = "green"

if light == "red":
    print("Stop")
elif light == "green":
    print("Go")
elif light == "yellow":
    print("Go fast")
else:
    print("Invalid light")

print("End of code")

Output:

Go
End of code

🧮 Grading Students Based on Marks

🎓 Conditions

  • marks >= 90 → Grade = A
  • 90 > marks >= 80 → Grade = B
  • 80 > marks >= 60 → Grade = C
  • marks < 60 → Grade = D
🔗 Click to view example 
marks = int(input("Enter your marks: "))
if marks >= 90:
    grade = "A"
elif marks < 90 and marks >= 80:
    grade = "B"
elif marks < 80 and marks >= 60:
    grade = "C"
else:
    grade = "D"

print("Grade is:", grade)

Example Input:

85

Output:

Grade is: B

🔄 Nested Conditions

🔗 Click to view example 
age = 64
if age >= 18:
    if age >= 90:
        print("Can't drive")
    else:
        print("Can drive")
else:
    print("Can't drive")

Example Output:

Can drive

🛠️ Practice Problems

🧮 Problem 1: Odd or Even

🔗 Click to view solution 
num = int(input("Enter a valid number: "))
if num % 2 == 0:
    print("Even")
else:
    print("Odd")

Example Input:

5

Output:

Odd

🏆 Problem 2: Find the Greatest of Three Numbers

🔗 Click to view solution 
a = int(input("Enter the first number: "))
b = int(input("Enter the second number: "))
c = int(input("Enter the third number: "))

if a > b and a > c:
    print("a is greater")
elif b > a and b > c:
    print("b is greater")
else:
    print("c is greater")

Example Input:

a = 7, b = 12, c = 5

Output:

b is greater

🧮 Problem 3: Check if a Number is a Multiple of 7

🔗 Click to view solution 
x = int(input("Enter a number: "))
if x % 7 == 0:
    print("Multiple of 7")
else:
    print("Not a multiple of 7")

Example Input:

14

Output:

Multiple of 7

Prepared by: Md Noushad Jahan Ramim
Contact: contactwithnoushad@gmail.com