 # 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 :

### 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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