Program to Print Series 1,2,8,16,32...n

Python Program to Print Series 1, 2, 4, 8, 16, 32…n

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In the previous article, we have discussed Python Program to Swap Upper Diagonal Elements with Lower Diagonal Elements of Matrix.
Given a number N and the task is to print the series (1,2,4,8,16,32…N) till the given number N in Python.

Examples:

Example1:

Input:

Given Number = 200

Output:

The above series till the given number{ 200 } is : 
1 2 4 8 16 32 64 128

Explanation:

1, 1*2, 2*2, 4*2, 8*2, 16*2, 32*2, 64*2
we cannot have 128*2=256 because it exceeds the given limit number 200.

Example2:

Input:

Given Number = 50

Output:

The above series till the given number{ 50 } is :
1 2 4 8 16 32

Explanation:

1, 1*2, 2*2, 4*2, 8*2, 16*2
we cannot have 32*2= 64 because it exceeds the given limit number 50.

Program to Print Series 1,2,8,16,32…n in Python

Below are the ways to print the series (1,2,8,16,32…N) till the given number N in Python:

Method #1: Using While Loop (Static Input)

Approach:

  • Give the number N as static input and store it in a variable.
  • Take a variable to say itr and initialize its value to 1.
  • Loop until the above-declared variable itr value is less than or equal to the given number using the while loop.
  • If it is true then print the value of itr separated by spaces.
  • Multiply the itr value with 2 and store it in the same variable itr.
  • The Exit of the Program.

Below is the implementation:

# Give the number N as static input and store it in a variable.
gvn_numb = 200
# Take a variable to say itr and initialize its value to 1.
itr = 1
# Loop until the above-declared variable itr value is less than or equal to the
# given number using the while loop.
print("The above series till the given number{", gvn_numb, "} is :")
while itr <= gvn_numb:
  # If it is true then print the value of itr separated by spaces.
    print(itr, end=" ")
    # Multiply the itr value with 2 and store it in the same variable itr.
    itr *= 2

Output:

The above series till the given number{ 200 } is :
1 2 4 8 16 32 64 128

Method #2: Using While loop (User Input)

Approach:

  • Give the number N as user input using the int(input()) function and store it in a variable.
  • Take a variable to say itr and initialize its value to 1.
  • Loop until the above-declared variable itr value is less than or equal to the given number using the while loop.
  • If it is true then print the value of itr separated by spaces.
  • Multiply the itr value with 2 and store it in the same variable itr.
  • The Exit of the Program.

Below is the implementation:

# Give the number N as user input using the int(input()) function and store it in a variable.
gvn_numb = int(input("Enter some Random Number = "))
# Take a variable to say itr and initialize its value to 1.
itr = 1
# Loop until the above-declared variable itr value is less than or equal to the
# given number using the while loop.
print("The above series till the given number{", gvn_numb, "} is :")
while itr <= gvn_numb:
  # If it is true then print the value of itr separated by spaces.
    print(itr, end=" ")
    # Multiply the itr value with 2 and store it in the same variable itr.
    itr *= 2

Output:

Enter some Random Number = 50
The above series till the given number{ 50 } is :
1 2 4 8 16 32

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