Python Program to Convert a Decimal Number to Binary

In the previous article, we have discussed Python Program to Convert Decimal to Octal using While loop
Given a decimal number and the task is to get the respective binary number for a given number.

Examples:

Example1:

Input:

Given Number = 7

Output:

The Binary value of the given decimal number { 7 } is: 
111

Example2:

Input:

Given Number = 9

Output:

The Binary value of the given decimal number { 9 } is: 
1001

Program to Convert a Decimal Number to Binary in Python

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

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 binry_num and initialize its value with 0.
Loop till the given number is not equal to zero using the while loop.
Inside the loop, calculate the value of the given number modulus 2 and store it in a variable remdr.
Divide the given number by 2 and store it in the same variable gvn_numb.
Multiply a with the remdr and store it in another variable b
Add b to the binry_num and convert to int using the int() function.
Store it in the same variable binry_num.
Multiply a with 10 and Store it in the same variable ‘a’.
Print the binry_num to get the binary 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 = 7
# Take a variable say 'a 'and initialize its value with 1.
a = 1
# Take another variable say binry_num and initialize its value with 0.
binry_num = 0
print("The Binary value of the given decimal number {", gvn_numb, "} is: ")
# Loop till the given number is not equal to zero using the while loop.
while (gvn_numb != 0):
  # Inside the loop, calculate the value of the given number modulus 2 and
    # store it in a variable remdr.
    remdr = gvn_numb % 2
  # Divide the given number by 2 and store it in the same variable gvn_numb.
    gvn_numb = gvn_numb // 2
    # Multiply a with the remdr and store it in another variable b
    b = (remdr * a)
    # Add b to the binry_num and convert to int using the int() function.
    # Store it in the same variable binry_num.
    binry_num = int(binry_num + b)
    # Multiply a with 10 and Store it in the same variable 'a'.
    a = int(a * 10)
 # Print the binry_num to get the binary value of the given decimal number.
print(binry_num)

Output:

The Binary value of the given decimal number { 7 } is: 
111

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 binry_num and initialize its value with 0.
Loop till the given number is not equal to zero using the while loop.
Inside the loop, calculate the value of the given number modulus 2 and store it in a variable remdr.
Divide the given number by 2 and store it in the same variable gvn_numb.
Multiply a with the remdr and store it in another variable b
Add b to the binry_num and convert to int using the int() function.
Store it in the same variable binry_num.
Multiply a with 10 and Store it in the same variable ‘a’.
Print the binry_num to get the binary 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
# Take another variable say binry_num and initialize its value with 0.
binry_num = 0
print("The Binary value of the given decimal number {", gvn_numb, "} is: ")
# Loop till the given number is not equal to zero using the while loop.
while (gvn_numb != 0):
  # Inside the loop, calculate the value of the given number modulus 2 and
    # store it in a variable remdr.
    remdr = gvn_numb % 2
  # Divide the given number by 2 and store it in the same variable gvn_numb.
    gvn_numb = gvn_numb // 2
    # Multiply a with the remdr and store it in another variable b
    b = (remdr * a)
    # Add b to the binry_num and convert to int using the int() function.
    # Store it in the same variable binry_num.
    binry_num = int(binry_num + b)
    # Multiply a with 10 and Store it in the same variable 'a'.
    a = int(a * 10)
 # Print the binry_num to get the binary value of the given decimal number.
print(binry_num)

Output:

Enter some random Number = 9
The Binary value of the given decimal number { 9 } is: 
1001

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