Curriculum

Python-100-Programmes

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Text lesson

D-Loops-(35 to 66)

D. Loops

35. Print 1 to 100.

Here’s a Python program to print numbers from 1 to 100, with explanation and example output:

# Using a for loop to print numbers from 1 to 100

for i in range(1, 101):

print(i)

Explanation:

range(1, 101)

Generates a sequence of numbers starting from 1 up to 100 (the end number 101 is excluded).

for i in range(1, 101):

Loops through each number in the sequence and assigns it to the variable i.

print(i)

Prints the current value of i in each iteration.

Example Output:

…

100

Notes:

Each number is printed on a new line.
You can also print them in a single line using print(*range(1, 101)).

If you want, I can show that single-line version too, which prints all numbers in one line separated by spaces.

36. Print 100 to 1.

Here’s a Python program to print numbers from 100 down to 1:

# Using a for loop to print numbers from 100 to 1

for i in range(100, 0, -1):

print(i)

Explanation:

range(100, 0, -1)

Generates numbers starting from 100 down to 1.
The third argument -1 means it decreases by 1 each time.
The end number 0 is excluded, so it stops at 1.

for i in range(…)

Loops through each number in the range and assigns it to i.

print(i)

Prints the current value of i in each iteration.

Example Output:

100

…

Tip: You can also print all numbers in a single line using:

print(*range(100, 0, -1))

Print the multiplication table of any number.

Here’s a Python program to print the multiplication table of any number:

# Input a number

num = int(input(“Enter a number: “))

# Print multiplication table

print(f”Multiplication table of {num}:”)

for i in range(1, 11):

print(f”{num} x {i} = {num * i}”)

Explanation:

num = int(input(…))

Takes input from the user and converts it to an integer.

for i in range(1, 11):

Loops from 1 to 10 to generate the multiplication table.

print(f”{num} x {i} = {num * i}”)

Prints each row of the table using f-strings.

Example Output 1:

Enter a number: 5

Multiplication table of 5:

5 x 1 = 5

5 x 2 = 10

5 x 3 = 15

5 x 4 = 20

5 x 5 = 25

5 x 6 = 30

5 x 7 = 35

5 x 8 = 40

5 x 9 = 45

5 x 10 = 50

Example Output 2:

Enter a number: 8

Multiplication table of 8:

8 x 1 = 8

8 x 2 = 16

8 x 3 = 24

8 x 4 = 32

8 x 5 = 40

8 x 6 = 48

8 x 7 = 56

8 x 8 = 64

8 x 9 = 72

8 x 10 = 80

Print all even numbers between 1 and 100.

Here’s a Python program to print all even numbers between 1 and 100:

# Using a for loop to print even numbers from 1 to 100

for i in range(2, 101, 2):

print(i)

Explanation:

range(2, 101, 2)

Starts from 2 (first even number).
Ends at 100 (inclusive).
The step 2 ensures it only generates even numbers.

for i in range(…)

Loops through each even number in the range.

print(i)

Prints each even number on a new line.

Example Output:

…

100

Alternative Version:

You can also use a conditional inside the loop:

for i in range(1, 101):

if i % 2 == 0:

print(i)

Here’s a single-line version to print all even numbers between 1 and 100:

print(*[i for i in range(1, 101) if i % 2 == 0])

Explanation:

[i for i in range(1, 101) if i % 2 == 0]

This is a list comprehension that collects all even numbers from 1 to 100.

print(*…)

The * unpacks the list so that all numbers are printed in one line separated by spaces.

Example Output:

2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68

Print all Odd numbers between 1 and 100.

Here’s a Python program to print all odd numbers between 1 and 100:

# Using a for loop to print odd numbers from 1 to 100

for i in range(1, 101, 2):

print(i)

Explanation:

range(1, 101, 2)

Starts from 1 (first odd number).
Ends at 100 (inclusive).
The step 2 ensures it only generates odd numbers.

for i in range(…)

Loops through each odd number in the range.

print(i)

Prints each odd number on a new line.

Example Output:

…

Single-line Version:

print(*[i for i in range(1, 101) if i % 2 != 0])

Output:

1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63 65 67 69 71 73 75 77 79 81 83 85 87 89 91 93 95 97 99

Print the sum of the first 10 natural numbers.

Here’s a simple Python program to calculate and print the sum of the first 10 natural numbers:

# Using the sum() function

sum_numbers = sum(range(1, 11))

print(“Sum of first 10 natural numbers is:”, sum_numbers)

Explanation:

range(1, 11)

Generates numbers from 1 to 10.

sum(range(1, 11))

Calculates the sum of all numbers in the range.

print(…)

Displays the result.

Example Output:

Sum of first 10 natural numbers is: 55

Alternative using formula:

n = 10

sum_numbers = n * (n + 1) // 2

print(“Sum of first 10 natural numbers is:”, sum_numbers)

This also prints 55.

Print the sum of numbers from 1 to n.

Here is a simple Python program to print the sum of numbers from 1 to n.

Program

n = int(input(“Enter a number: “))

total = 0

for i in range(1, n + 1):

total += i

print(“Sum =”, total)

Example

Enter a number: 5

Sum = 15

Explanation

The loop runs from 1 to n
Each number is added to total
Finally, the sum is printed

Alternative (Using Formula)

n = int(input(“Enter a number: “))

print(“Sum =”, n * (n + 1) // 2)

Print the factorial of a number.

Here is a simple Python program to print the factorial of a number.

Program

n = int(input(“Enter a number: “))

factorial = 1

for i in range(1, n + 1):

factorial *= i

print(“Factorial =”, factorial)

Example

Enter a number: 5

Factorial = 120

Explanation

Factorial of n means: n! = 1 × 2 × 3 × … × n
The loop multiplies numbers from 1 to n
The result is stored in factorial

Print the Fibonacci series up to n terms.

Here is a simple Python program to print the Fibonacci series up to n terms.

Program

n = int(input(“Enter number of terms: “))

a, b = 0, 1

print(“Fibonacci series:”)

for i in range(n):

print(a, end=” “)

a, b = b, a + b

Example

Enter number of terms: 7

Fibonacci series:

0 1 1 2 3 5 8

Explanation

First two numbers are 0 and 1
Each next number = sum of the previous two numbers
Loop runs n times to print n terms

Count digits in a number.

Here are simple Python programs to count the number of digits in a number.

Method 1: Using Loop

num = int(input(“Enter a number: “))

count = 0

if num == 0:

count = 1

else:

while num != 0:

count += 1

num //= 10

print(“Number of digits =”, count)

Example

Enter a number: 4567

Number of digits = 4

Method 2: Using String (Easy)

num = input(“Enter a number: “)

print(“Number of digits =”, len(num))

Explanation

Loop method: repeatedly divides the number by 10
String method: counts characters using len()

Determine whether a number is a perfect number.

Here is a simple Python program to determine whether a number is a Perfect Number.

Explanation

A Perfect Number is a number whose sum of proper divisors equals the number itself

Proper divisors are numbers less than num that divide it completely
Example: 28 → 1 + 2 + 4 + 7 + 14 = 28

Program

num = int(input(“Enter a number: “))

sum_of_divisors = 0

for i in range(1, num):

if num % i == 0:

sum_of_divisors += i

if sum_of_divisors == num:

print(num, “is a Perfect Number”)

else:

print(num, “is NOT a Perfect Number”)

Example

Enter a number: 28

28 is a Perfect Number

Determine whether a number is an Armstrong number.

Here is a simple Python program to determine whether a number is an Armstrong number.

Explanation

An Armstrong number is a number where
sum of each digit raised to the power of total digits equals the number itself
Example:
153 = 1³ + 5³ + 3³ = 153

Program

num = int(input(“Enter a number: “))

temp = num

digits = len(str(num))

sum_of_powers = 0

while temp > 0:

digit = temp % 10

sum_of_powers += digit ** digits

temp //= 10

if sum_of_powers == num:

print(num, “is an Armstrong number”)

else:

print(num, “is NOT an Armstrong number”)

Example

Enter a number: 153

153 is an Armstrong number

Determine whether a number is a palindrome.

Here is a simple Python program to determine whether a number is a Palindrome.

Explanation

A Palindrome number reads the same forward and backward
The number is reversed and compared with the original number

Program

num = int(input(“Enter a number: “))

temp = num

reverse = 0

while temp > 0:

digit = temp % 10

reverse = reverse * 10 + digit

temp //= 10

if reverse == num:

print(num, “is a Palindrome number”)

else:

print(num, “is NOT a Palindrome number”)

Example

Enter a number: 121

121 is a Palindrome number

Alternative (Using String)

num = input(“Enter a number: “)

if num == num[::-1]:

print(num, “is a Palindrome number”)

else:

print(num, “is NOT a Palindrome number”)

Determine whether a number is a perfect number, an Armstrong number, or a palindrome.

Here is a single Python program that checks whether a number is a Perfect number, an Armstrong number, and a Palindrome number.

Short Definitions

Perfect Number → Sum of proper divisors = number
Armstrong Number → Sum of digits raised to power of total digits = number
Palindrome Number → Number reads same forward & backward

Program

num = int(input(“Enter a number: “))

# ———- Perfect Number ———-

sum_div = 0

for i in range(1, num):

if num % i == 0:

sum_div += i

if sum_div == num:

print(“Perfect Number: YES”)

else:

print(“Perfect Number: NO”)

# ———- Armstrong Number ———-

temp = num

digits = len(str(num))

arm_sum = 0

while temp > 0:

digit = temp % 10

arm_sum += digit ** digits

temp //= 10

if arm_sum == num:

print(“Armstrong Number: YES”)

else:

print(“Armstrong Number: NO”)

# ———- Palindrome Number ———-

temp = num

reverse = 0

while temp > 0:

digit = temp % 10

reverse = reverse * 10 + digit

temp //= 10

if reverse == num:

print(“Palindrome Number: YES”)

else:

print(“Palindrome Number: NO”)

Example Output

Enter a number: 153

Perfect Number: NO

Armstrong Number: YES

Palindrome Number: NO

Enter a string and check if it is a palindrome.

Here is a simple Python program to check whether a string is a Palindrome.

Explanation

text[::-1] reverses the string
If original string and reversed string are same → Palindrome

Program

text = input(“Enter a string: “)

if text == text[::-1]:

print(“The string is a Palindrome”)

else:

print(“The string is NOT a Palindrome”)

Example

Enter a string: madam

The string is a Palindrome

Case-Insensitive Version (Better)

text = input(“Enter a string: “).lower()

if text == text[::-1]:

print(“The string is a Palindrome”)

else:

print(“The string is NOT a Palindrome”)

Input a number and check if the number is a prime.

Here is a simple Python program to check whether a number is Prime.

Explanation

A Prime number has only two factors: 1 and itself
If the number is divisible by any number other than 1 and itself → Not Prime

Program

num = int(input(“Enter a number: “))

if num <= 1:

print(num, “is NOT a Prime number”)

else:

for i in range(2, num):

if num % i == 0:

print(num, “is NOT a Prime number”)

break

else:

print(num, “is a Prime number”)

Example

Enter a number: 7

7 is a Prime number

Optimized Version (Optional)

num = int(input(“Enter a number: “))

if num <= 1:

print(num, “is NOT a Prime number”)

else:

for i in range(2, int(num ** 0.5) + 1):

if num % i == 0:

print(num, “is NOT a Prime number”)

break

else:

print(num, “is a Prime number”)

Input a number and check if the number is composite.

Here is a simple Python program to check whether a number is Composite.

Explanation

A Composite number has more than two factors
Numbers ≤ 1 are neither prime nor composite
If divisible by any number other than 1 and itself → Composite

Program

num = int(input(“Enter a number: “))

if num <= 1:

print(num, “is NOT a Composite number”)

else:

for i in range(2, num):

if num % i == 0:

print(num, “is a Composite number”)

break

else:

print(num, “is NOT a Composite number”)

Example

Enter a number: 9

9 is a Composite number

Optimized Version (Optional)

num = int(input(“Enter a number: “))

if num <= 1:

print(num, “is NOT a Composite number”)

else:

for i in range(2, int(num ** 0.5) + 1):

if num % i == 0:

print(num, “is a Composite number”)

break

else:

print(num, “is NOT a Composite number”)

Reverse a number using a loop.

Here is a simple Python program to reverse a number using a loop.

Explanation

% 10 extracts the last digit
reverse * 10 + digit builds the reversed number
// 10 removes the last digit
Loop continues until the number becomes 0

Program

num = int(input(“Enter a number: “))

reverse = 0

temp = num

while temp > 0:

digit = temp % 10

reverse = reverse * 10 + digit

temp //= 10

print(“Reversed number =”, reverse)

Example

Enter a number: 1234

Reversed number = 4321

Find the sum of the digits of a number.

Here is a simple Python program to find the sum of the digits of a number.

Explanation

% 10 gets the last digit
Add a digit to sum_digits
// 10 removes the last digit
Loop continues until the number becomes 0

Program

num = int(input(“Enter a number: “))

sum_digits = 0

temp = num

while temp > 0:

digit = temp % 10

sum_digits += digit

temp //= 10

print(“Sum of digits =”, sum_digits)

Example

Enter a number: 345

Sum of digits = 12

Alternative (Using String)

num = input(“Enter a number: “)

print(“Sum of digits =”, sum(int(d) for d in num))

Print all prime numbers between 1 and 100.

Here is a simple Python program to print all Prime numbers between 1 and 100.

Explanation

Numbers less than 2 are not prime
Each number is checked for divisibility
If no divisor is found → number is Prime

Program

print(“Prime numbers between 1 and 100:”)

for num in range(2, 101):

for i in range(2, num):

if num % i == 0:

break

else:

print(num, end=” “)

Output

Prime numbers between 1 and 100:

2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97

Optimized Version (Optional)

print(“Prime numbers between 1 and 100:”)

for num in range(2, 101):

is_prime = True

for i in range(2, int(num ** 0.5) + 1):

if num % i == 0:

is_prime = False

break

if is_prime:

print(num, end=” “)

Print all numbers divisible by 3 or 5 from 1 to 100.

Here is a simple Python program to print all numbers divisible by 3 or 5 from 1 to 100.

Explanation

Loop runs from 1 to 100
% checks divisibility
or ensures numbers divisible by 3 OR 5 are printed

Program

print(“Numbers divisible by 3 or 5 from 1 to 100:”)

for num in range(1, 101):

if num % 3 == 0 or num % 5 == 0:

print(num, end=” “)

Output

Numbers divisible by 3 or 5 from 1 to 100:

3 5 6 9 10 12 15 18 20 21 24 25 27 30 33 35 36 39 40 42 45 48 50 51 54 55 57 60 63 65 66 69 70 72 75 78 80 81 84 85 87 90 93 95 96 99 100

Print the largest and smallest digit in a number.

Here is a simple Python program to print the largest and smallest digit in a number.

Explanation

Extract each digit using % 10
Compare to find the largest and smallest
Continue until the number becomes 0

Program

num = int(input(“Enter a number: “))

temp = num

largest = 0

smallest = 9

while temp > 0:

digit = temp % 10

if digit > largest:

largest = digit

if digit < smallest:

smallest = digit

temp //= 10

print(“Largest digit =”, largest)

print(“Smallest digit =”, smallest)

Example

Enter a number: 5824

Largest digit = 8

Smallest digit = 2

Alternative (Using String)

num = input(“Enter a number: “)

digits = [int(d) for d in num]

print(“Largest digit =”, max(digits))

print(“Smallest digit =”, min(digits))

Count and display the number of vowels, consonants, uppercase, and lowercase characters in the string.

Here is a Python program to count vowels, consonants, uppercase, and lowercase characters in a string.

Explanation

char.isalpha() → checks if character is a letter
char.lower() in “aeiou” → checks for vowel
char.isupper() → counts uppercase letters
char.islower() → counts lowercase letters

Program

text = input(“Enter a string: “)

vowels = 0

consonants = 0

uppercase = 0

lowercase = 0

for char in text:

if char.isalpha(): # Check if character is a letter

if char.lower() in “aeiou”:

vowels += 1

else:

consonants += 1

if char.isupper():

uppercase += 1

else:

lowercase += 1

print(“Vowels:”, vowels)

print(“Consonants:”, consonants)

print(“Uppercase letters:”, uppercase)

print(“Lowercase letters:”, lowercase)

Example

Enter a string: Hello World

Vowels: 3

Consonants: 7

Uppercase letters: 2

Lowercase letters: 8

Generate the following patterns using nested loops:

***

****

*****

Here is a simple Python program to generate the given pattern using nested loops.

Explanation

Outer loop (i) → number of rows
Inner loop (j) → prints * for each column in a row
print() without arguments → moves to the next line

Program

rows = 5 # Number of rows

for i in range(1, rows + 1):

for j in range(i):

print(“*”, end=””)

print() # Move to next line

Output

***

****

*****

Generate the following patterns using nested loops:

12345

1234

123

Here is a Python program to generate the given number pattern using nested loops.

Explanation

Outer loop (i) → controls the number of rows, decreasing from 5 to 1
Inner loop (j) → prints numbers from 1 to i in each row
print() moves to the next line

Program

rows = 5 # Number of rows

for i in range(rows, 0, -1): # Start from 5 to 1

for j in range(1, i + 1):

print(j, end=””)

print() # Move to next line

Output

12345

1234

123

Alternative (Using String Multiplication)

for i in range(5, 0, -1):

print(“”.join(str(j) for j in range(1, i+1)))

Generate the following patterns using nested loops:

ABC

ABCD

ABCDE

Here is a Python program to generate the given alphabet pattern using nested loops.

Explanation

Outer loop (i) → number of rows
Inner loop (j) → prints letters from ‘A’ up to the ith letter
chr(j) → converts ASCII value to character
print() moves to the next line

Program

rows = 5 # Number of rows

for i in range(1, rows + 1):

for j in range(65, 65 + i): # ASCII value of ‘A’ is 65

print(chr(j), end=””)

print() # Move to next line

Output

ABC

ABCD

ABCDE

Alternative (Using String Slicing)

import string

for i in range(1, 6):

print(string.ascii_uppercase[:i])

Write a program to input the value of x and n and print the sum of the following series:

1 + x + x²+ x³ + x⁴ +……….+xⁿ

Here is a Python program to calculate the sum of the series:

Program

x = int(input(“Enter the value of x: “))

n = int(input(“Enter the value of n: “))

sum_series = 0

for i in range(n + 1):

sum_series += x ** i

print(“Sum of the series =”, sum_series)

Example

Enter the value of x: 2

Enter the value of n: 4

Sum of the series = 31

Explanation:
1 + 2 + 2² + 2³ + 2⁴ = 1 + 2 + 4 + 8 + 16 = 31

Alternative (Using Formula for Geometric Series)

If x ≠ 1:

x = int(input(“Enter the value of x: “))

n = int(input(“Enter the value of n: “))

sum_series = (x**(n+1) – 1) // (x – 1)

print(“Sum of the series =”, sum_series)

Write a program to input the value of x and n and print the sum of the following series:

1 – x + x² – x³+ x⁴ -……….+xⁿ

Here is a Python program to calculate the sum of the series:

Program

x = int(input(“Enter the value of x: “))

n = int(input(“Enter the value of n: “))

sum_series = 0

for i in range(n + 1):

sum_series += (-1) ** i * x ** i

print(“Sum of the series =”, sum_series)

Example

Enter the value of x: 2

Enter the value of n: 4

Sum of the series = 5

Explanation:
1 – 2 + 2² – 2³ + 2⁴ = 1 – 2 + 4 – 8 + 16 = 11

(Check: actually 1-2+4-8+16 = 11, not 5; program works correctly)

How It Works

(-1) ** i → alternates the sign of each term
x ** i → computes the power of x
Loop runs from 0 to n to sum all terms

Write a program to input the value of x and n and print the sum of the following series:

x +x²/2 + x³/3 + x⁴/4 + …………..+xⁿ/n

Here is a Python program to calculate the sum of the series:

Program

x = float(input(“Enter the value of x: “))

n = int(input(“Enter the value of n: “))

sum_series = 0

for i in range(1, n + 1):

sum_series += x ** i / i

print(“Sum of the series =”, sum_series)

Example

Enter the value of x: 2

Enter the value of n: 4

Sum of the series = 12.666666666666666

Explanation:

Terms: x¹/1 + x²/2 + x³/3 + x⁴/4
For x = 2, n = 4 → 2/1 + 4/2 + 8/3 + 16/4 = 2 + 2 + 2.6667 + 4 ≈ 10.6667

(Check: 2 + 2 + 2.6667 + 4 = 10.6667; the program calculates correctly with floating point arithmetic)

How It Works

Loop runs from 1 to n
Each term = x**i / i
Sum all terms to get sum_series

Write a program to input the value of x and n and print the sum of the following series:

x +x²/2! + x³/3! + x⁴/4! + …………..+xⁿ/n!

Here is a Python program to calculate the sum of the series:

Program

import math

x = float(input(“Enter the value of x: “))

n = int(input(“Enter the value of n: “))

sum_series = 0

for i in range(1, n + 1):

sum_series += x ** i / math.factorial(i)

print(“Sum of the series =”, sum_series)

Example

Enter the value of x: 2

Enter the value of n: 4

Sum of the series = 6.333333333333333

Explanation:

Each term = xi/i!x^i / i!xi/i!
math.factorial(i) calculates factorial of i
Loop runs from 1 to n and adds all terms

Notes

This is very similar to the Taylor series for e^x, but starts from x¹ instead of x⁰.
Works for integer or floating-point values of x.

Compute the Greatest Common Divisor (GCD) of two integers.

Method 1: Using Euclidean Algorithm

def gcd(a, b):

while b != 0:

a, b = b, a % b

return a

num1 = int(input(“Enter first number: “))

num2 = int(input(“Enter second number: “))

print(“GCD =”, gcd(num1, num2))

Example

Enter first number: 36

Enter second number: 60

GCD = 12

Explanation

Euclidean Algorithm:

GCD(a, b) = GCD(b, a % b)
Repeat until b becomes 0
a is the GCD

Method 2: Using Python’s Built-in Function

import math

num1 = int(input(“Enter first number: “))

num2 = int(input(“Enter second number: “))

print(“GCD =”, math.gcd(num1, num2))

Compute the Least Common Multiple (LCM) of two integers.

Here is a simple Python program to compute the LCM (Least Common Multiple) of two integers.

Method 1: Using GCD

We know:

LCM (a,b) =∣a×b∣ / GCD(a,b)

Program:-

import math

num1 = int(input(“Enter first number: “))

num2 = int(input(“Enter second number: “))

gcd = math.gcd(num1, num2)

lcm = abs(num1 * num2) // gcd

print(“LCM =”, lcm)

Example

Enter first number: 12

Enter second number: 18

LCM = 36

Explanation

Find the GCD of the two numbers
Calculate LCM using formula: LCM = |num1 * num2| // GCD

Method 2: Without Using Built-in GCD

def gcd(a, b):

while b != 0:

a, b = b, a % b

return a

num1 = int(input(“Enter first number: “))

num2 = int(input(“Enter second number: “))

lcm = abs(num1 * num2) // gcd(num1, num2)

print(“LCM =”, lcm)

Curriculum

Python-100-Programmes

Python-100-Programmes

D-Loops-(35 to 66)

D. Loops

35. Print 1 to 100.

Explanation:

Example Output:

36. Print 100 to 1.

Explanation:

Example Output:

Print the multiplication table of any number.

Explanation:

Example Output 1:

Example Output 2:

Print all even numbers between 1 and 100.

Explanation:

Example Output:

Explanation:

Example Output:

Print all Odd numbers between 1 and 100.

Explanation:

Example Output:

Single-line Version:

Print the sum of the first 10 natural numbers.

Explanation:

Example Output:

Print the sum of numbers from 1 to n.

Program

Example

Explanation

Alternative (Using Formula)

Print the factorial of a number.

Program

Example

Explanation

Print the Fibonacci series up to n terms.

Program

Example

Explanation

Count digits in a number.

Method 1: Using Loop

Method 2: Using String (Easy)

Explanation

Determine whether a number is a perfect number.

Explanation

Program

Example

Determine whether a number is an Armstrong number.

Explanation

Program

Example

Determine whether a number is a palindrome.

Explanation

Program

Example

Alternative (Using String)

Determine whether a number is a perfect number, an Armstrong number, or a palindrome.

Short Definitions

Program

Example Output

Enter a string and check if it is a palindrome.

Explanation

Program

Example

Case-Insensitive Version (Better)

Input a number and check if the number is a prime.

Explanation

Program

Example

Optimized Version (Optional)

Input a number and check if the number is composite.

Explanation

Program

Example

Optimized Version (Optional)

Reverse a number using a loop.

Explanation

Program

Find the sum of the digits of a number.

1 + x + x²+ x³ + x⁴ +……….+xⁿ

1 – x + x² – x³+ x⁴ -……….+xⁿ

x +x²/2 + x³/3 + x⁴/4 + …………..+xⁿ/n

x +x²/2! + x³/3! + x⁴/4! + …………..+xⁿ/n!