Sequences and Conversions Examples

Learn to generate Fibonacci numbers, use recursion, and convert decimals to binary, octal, and hex. Master sequence logic and numeric transformations that frequently appear in practice questions.

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Python Program to Convert Decimal to Binary Using Recursion

Recursive conversion.

def tobin(n):
    return '0' if n == 0 else (tobin(n//2).lstrip('0') + str(n%2))
print(tobin(10))

Output

1010

Python Program to Print the Fibonacci sequence

Generates Fibonacci numbers.

n = 10
a, b = 0, 1
out = []
for _ in range(n):
    out.append(a)
    a, b = b, a + b
print(out)

Output

[0, 1, 1, 2, 3, 5, 8, 13, 21, 34]

Python Program to Convert Decimal to Binary, Octal and Hexadecimal

Converts base representations.

n = 255
print(bin(n))
print(oct(n))
print(hex(n))

Output

0b11111111
0o377
0xff

Python Program to Find ASCII Value of Character

Uses ord().

print(ord('A'))

Output

65

Python Program to Display Fibonacci Sequence Using Recursion

Uses recursive function.

def fib(n):
    return n if n < 2 else fib(n-1) + fib(n-2)
print([fib(i) for i in range(10)])

Output

[0, 1, 1, 2, 3, 5, 8, 13, 21, 34]

Python Program to Find Sum of Natural Numbers Using Recursion

Recursive sum.

def sumN(n):
    return n if n <= 1 else n + sumN(n-1)
print(sumN(10))

Output

55

Python Program to Find Factorial of Number Using Recursion

Recursive factorial.

def fact(n):
    return 1 if n <= 1 else n * fact(n-1)
print(fact(5))

Output

120

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