Several example codes

Program Overview

This Python program reads an integer from the user and checks whether it is part of the Fibonacci sequence.
The Fibonacci sequence starts with 0 and 1, and each subsequent number is the sum of the previous two.

Python Code:

# Read input number from user
n = int(input("Enter a number: "))

# Check if the number is in the Fibonacci sequence
a, b = 0, 1
found = False

while a <= n:
    if a == n:
        found = True
        break
    a, b = b, a + b

# Display result
if found:
    print(f"{n} is a Fibonacci number.")
else:
    print(f"{n} is not a Fibonacci number.")

Sample Output:

Enter a number: 13  
13 is a Fibonacci number.

Enter a number: 14  
14 is not a Fibonacci number.

Step-by-Step Explanation:

- The program starts with a = 0 and b = 1
- It generates Fibonacci numbers until it reaches or exceeds n
- If n matches any generated value, it is part of the sequence
- Otherwise, the loop ends and the program reports that n is not in the sequence