Python Program to Check If A Number Is A Happy Number

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Given a number, the task is to check whether the given number is a happy number or not.

Happy Number :

If the repeating sum of the digits squared equals one, the number is said to be a Happy Number. If we continue this method and get outcome 1, we have a happy number. If the outcome is 4, it enters an infinite loop and is not a happy number. Let’s look at an example to help you grasp it better.

Given Number = 320
Square of the digits = 3²+ 2² + 0²= 13
Square of the digits = 1² + 3² = 10
Square of the digits = 1² + 0² = 1

Other Examples of happy numbers =7, 28, 100 etc.

Examples:

Example1:

Input:

Given number =100

Output:

The given number [ 100 ] is a happy number

Example2:

Input:

Given number = 28

Output:

The given number [ 28 ] is a happy number

Program to Check If A Number Is A Happy Number in Python

Below are the ways to check whether the given number is a happy number or not.

Using For loop(Static Input)
Using For loop(User Input)

Method #1: Using For Loop (Static Input)

Approach:

Give the number as static input and store it in a variable.
Create a function digitSquareSum() that accepts the given number as an argument and returns the sum of squares of digits.
Inside the digitSquareSum() function.
Convert the given argument to string using the str() function.
Convert the given argument into list of digits using list(),map(),int() functions.
Store it in a variable.
Take a variable sumsquaredigits and initialize its value to 0.
Loop in this digits list using For loop.
Increment the value of sumsquaredigits by the square of the digit(iterator value).
Return the sumsquaredigits value.
Take a variable reslt and initialize its value to the given number.
Loop till the reslt is not equal to 1 or 4 using while loop.
Inside the loop pass the reslt value to digitSquareSum() and store it in the same variable reslt.
After the end of the while loop, Check whether reslt value is 1 or not using the If statement.
If it is true then the given number is a happy number.
Else it is not a happy number.
The Exit of the Program.

Below is the implementation:

# Create a function digitSquareSum() that accepts the given number
# as an argument and returns the sum of squares of digits.


def digitSquareSum(resltnumber):
    # Inside the digitSquareSum() function.
    # Convert the given argument to string using the str() function.
    strnumbe = str(resltnumber)
    # Convert the given argument into list of digits using list(),map(),int() functions.
    # Store it in a variable.
    numbrlistdigits = list(map(int, strnumbe))
    # Take a variable sumsquaredigits and initialize its value to 0.
    sumsquaredigits = 0
    # Loop in this digits list using For loop.
    for digitvalu in numbrlistdigits:
        # Increment the value of sumsquaredigits by the square
        # of the digit(iterator value).
        sumsquaredigits = sumsquaredigits+(digitvalu**2)
    # Return the sumsquaredigits value
    return sumsquaredigits


# Give the number as static input and store it in a variable.
numbr = 100
# Take a variable reslt and initialize its value to the given number.
reslt = numbr
# Loop till the reslt is not equal to 1 or 4 using while loop.
while(reslt != 1 and reslt != 4):
    # Inside the loop pass the reslt value to digitSquareSum()
    # and store it in the same variable reslt.
    reslt = digitSquareSum(reslt)
# After the end of the while loop,
# Check whether reslt value is 1 or not using the If statement.
if(reslt == 1):
    # If it is true then the given number is a happy number.
    print('The given number [', numbr, '] is a happy number')
else:
    # Else it is not a happy number.
    print('The given number [', numbr, '] is not a happy number')

Output:

The given number [ 100 ] is a happy number

Method #2: Using For Loop (User Input)

Approach:

Give the number as user input using int(input()) and store it in a variable.
Create a function digitSquareSum() that accepts the given number as an argument and returns the sum of squares of digits.
Inside the digitSquareSum() function.
Convert the given argument to string using the str() function.
Convert the given argument into list of digits using list(),map(),int() functions.
Store it in a variable.
Take a variable sumsquaredigits and initialize its value to 0.
Loop in this digits list using For loop.
Increment the value of sumsquaredigits by the square of the digit(iterator value).
Return the sumsquaredigits value.
Take a variable reslt and initialize its value to the given number.
Loop till the reslt is not equal to 1 or 4 using while loop.
Inside the loop pass the reslt value to digitSquareSum() and store it in the same variable reslt.
After the end of the while loop, Check whether reslt value is 1 or not using the If statement.
If it is true then the given number is a happy number.
Else it is not a happy number.
The Exit of the Program.

Below is the implementation:

# Create a function digitSquareSum() that accepts the given number
# as an argument and returns the sum of squares of digits.


def digitSquareSum(resltnumber):
    # Inside the digitSquareSum() function.
    # Convert the given argument to string using the str() function.
    strnumbe = str(resltnumber)
    # Convert the given argument into list of digits using list(),map(),int() functions.
    # Store it in a variable.
    numbrlistdigits = list(map(int, strnumbe))
    # Take a variable sumsquaredigits and initialize its value to 0.
    sumsquaredigits = 0
    # Loop in this digits list using For loop.
    for digitvalu in numbrlistdigits:
        # Increment the value of sumsquaredigits by the square
        # of the digit(iterator value).
        sumsquaredigits = sumsquaredigits+(digitvalu**2)
    # Return the sumsquaredigits value
    return sumsquaredigits


# Give the number as user input using int(input()) and store it in a variable.
numbr = int(input(
    'Enter some random number to check whether the number is happy number or not = '))
# Take a variable reslt and initialize its value to the given number.
reslt = numbr
# Loop till the reslt is not equal to 1 or 4 using while loop.
while(reslt != 1 and reslt != 4):
    # Inside the loop pass the reslt value to digitSquareSum()
    # and store it in the same variable reslt.
    reslt = digitSquareSum(reslt)
# After the end of the while loop,
# Check whether reslt value is 1 or not using the If statement.
if(reslt == 1):
    # If it is true then the given number is a happy number.
    print('The given number [', numbr, '] is a happy number')
else:
    # Else it is not a happy number.
    print('The given number [', numbr, '] is not a happy number')

Output:

The given number [ 100 ] is a happy number

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