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 :

### 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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