🚀 Day 9/150 – Check Positive or Negative Number in Python

 

1️⃣ Method 1 – Using If-Else Conditions

The simplest and most common approach.

num = 10 if num > 0: print("Positive number") elif num < 0: print("Negative number") else: print("Zero")

Output

Positive number

✔ Easy to understand
✔ Best for beginners

2️⃣ Method 2 – Taking User Input

Make the program interactive.

num = float(input("Enter a number: "))

if num > 0:
    print("Positive number")
elif num < 0:
    print("Negative number")
else:
    print("Zero")

✔ Works with decimal numbers
✔ Useful in real-world applications

3️⃣ Method 3 – Using a Function

Reusable and clean approach.

def check_number(n):
    if n > 0:
        return "Positive"
    elif n < 0:
        return "Negative"
    else:
        return "Zero"

print(check_number(-5))

✔ Reusable logic
✔ Cleaner code

4️⃣ Method 4 – Using Lambda Function

One-line solution using lambda.

check = lambda n: "Positive" if n > 0 else ("Negative" if n < 0 else "Zero") print(check(0))

✔ Compact code

✔ Useful for quick operations

🎯 Key Takeaways

Today you learned:

• Conditional statements (if, elif, else)
• Handling user input
• Writing reusable functions
• Using lambda expressions