Python Program to Convert Decimal to Octal using While loop

In the previous article, we have discussed Python Program to Find out How many 1 and 0 in a Given Number.
Given a decimal number and the task is to get the respective octal number using the while loop in Python.

Examples:

Example1:

Input:

Given Number = 15

Output:

The Octal value of the given decimal number { 15 } is: 
17

Example2:

Input:

Given Number = 25

Output:

The Octal value of the given decimal number { 25 } is: 
31

Program to Convert Decimal to Octal using While loop in Python

Below are the ways to convert the given decimal number into octal :

Using While Loop (Static Input)
Using While loop (User Input)

Method #1: Using While Loop (Static Input)

Approach:

Give the number as static input and store it in a variable.
Take a variable say ‘a ‘and initialize its value with 1.
Take another variable say octl_num and initialize its value with 0.
Loop till the given number is not equal to zero using the while loop.
Multiply ‘a’ with the given number modulus 8 and store it in a variable say ‘b‘.
Add the above-got b to the octl_num and store it in the same variable octl_num.
Calculate the value of the given number divided by 8.
Store it in the same variable gvn_numb.
Multiply a with 10 and Store it in the same variable ‘a’.
Print the octl_num to get the octal value of the given decimal number.
The Exit of the Program.

Below is the implementation:

# Give the number as static input and store it in a variable.
gvn_numb = 15
# Take a variable say 'a 'and initialize its value with 1.
a = 1
print(
    "The Octal value of the given decimal number {", gvn_numb, "} is: ")
# Take another variable say octl_num and initialize its value with 0.
octl_num = 0
# Loop till the given number not equals to zero using the while loop.
while(gvn_numb != 0):
  # Multiply 'a' with the given number modulus 8 and store it in a variable say 'b'.
    b = (gvn_numb % 8)*a
  # Add the above-got b to the octl_num and store it in the same variable octl_num.
    octl_num = octl_num+b
 # Calculate the value of the given number divided by 8.
 # Store it in the same variable gvn_numb.
    gvn_numb = gvn_numb//8
   # Multiply a with 10 and Store it in the same variable 'a'.
    a = int(a*10)
 # Print the octl_num to get the octal value of the given decimal number.
print(octl_num)

Output:

The Octal value of the given decimal number { 15 } is: 
17

Method #2: Using While loop (User Input)

Approach:

Give the number as user input using the int(input()) function and store it in a variable.
Take a variable say ‘a ‘and initialize its value with 1.
Take another variable say octl_num and initialize its value with 0.
Loop till the given number is not equal to zero using the while loop.
Multiply ‘a’ with the given number modulus 8 and store it in a variable say ‘b‘.
Add the above-got b to the octl_num and store it in the same variable octl_num.
Calculate the value of the given number divided by 8.
Store it in the same variable gvn_numb.
Multiply a with 10 and Store it in the same variable ‘a’.
Print the octl_num to get the octal value of the given decimal number.
The Exit of the Program.

Below is the implementation:

# Give the number 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 say 'a 'and initialize its value with 1.
a = 1
print(
    "The Octal value of the given decimal number {", gvn_numb, "} is: ")
# Take another variable say octl_num and initialize its value with 0.
octl_num = 0
# Loop till the given number not equals to zero using the while loop.
while(gvn_numb != 0):
  # Multiply 'a' with the given number modulus 8 and store it in a variable say 'b'.
    b = (gvn_numb % 8)*a
  # Add the above-got b to the octl_num and store it in the same variable octl_num.
    octl_num = octl_num+b
 # Calculate the value of the given number divided by 8.
 # Store it in the same variable gvn_numb.
    gvn_numb = gvn_numb//8
   # Multiply a with 10 and Store it in the same variable 'a'.
    a = int(a*10)
 # Print the octl_num to get the octal value of the given decimal number.
print(octl_num)

Output:

Enter some random number = 25
The Octal value of the given decimal number { 25 } is: 
31

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