Program to Print all Happy Numbers within a given Range

Python Program to Print all Happy Numbers within a given Range

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In this article, we will learn how to print happy numbers within a specific range in Python. You will learn what a happy number is, how to check whether a given number is a happy number, and how to write Python code that outputs all the happy numbers within the user-specified range.

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 upper limit range =19
Given lower limit range =145

Output:

The happy numbers in the given range 19 and 145 are:
19 23 28 31 32 44 49 68 70 79 82 86 91 94 97 100 103 109 129 130 133 139

Example2:

Input:

Given upper limit range =333
Given lower limit range =444

Output:

The happy numbers in the given range 333 and 444 are:
338 356 362 365 367 368 376 379 383 386 391 392 397 404 409 440

Program to Print all Happy numbers within a given range in Python

Below are the ways to print all the happy numbers in the given range.

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Method #1: Using For Loop (Static Input)

Approach:

  • Create a function checkhapppynumb() which accepts the number as an argument and returns true if it is happy number else returns False.
  • Give the lower limit range as static input and store it in a variable.
  • Give the upper limit range as static input and store it in another 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.
  • Loop from lower limit range to upper limit range using For loop.
  • Inside the for loop pass the iterator value to checkhapppynumb() function.
  • Inside the checkhapppynumb() function.
  • Take a variable reslt and initialize its value to the given argument.
  • 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 so return True
  • Else it is not a happy number so return False.
  • If it returns true then print the iterator value with space.
  • 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

# Create a function checkhapppynumb() which accepts the number as an argument
# and returns true if it is happy number else returns False.


def checkhapppynumb(numb):
    # Take a variable rest and initialize its value to the given argument.
    rest = numb
    # Loop till the rest is not equal to 1 or 4 using while loop.
    while(rest != 1 and rest != 4):
        # Inside the loop pass the reslt value to digitSquareSum()
        # and store it in the same variable reslt.
        rest = digitSquareSum(rest)
    # After the end of the while loop,
    # Check whether rest value is 1 or not using the If statement.
    if(rest == 1):
        # If it is true then the given number is a happy number so return True
        return True
    else:
        # Else it is not a happy number so return False.
        return False


# Give the lower limit range as static input and store it in a variable.
lowlimrange = 19
# Give the upper limit range as static input and store it in another variable.
upplimrange = 145
print('The happy numbers in the given range',
      lowlimrange, 'and', upplimrange, 'are:')
# Loop from lower limit range to upper limit range using For loop.
for l in range(lowlimrange, upplimrange+1):
        # IInside the for loop pass the iterator value to checkhapppynumb() function.
    if(checkhapppynumb(l)):
        # If it returns true then print the iterator value.
        print(l, end=' ')

Output:

The happy numbers in the given range 19 and 145 are:
19 23 28 31 32 44 49 68 70 79 82 86 91 94 97 100 103 109 129 130 133 139

Method #2: Using For Loop (User Input)

Approach:

  • Create a function checkhapppynumb() which accepts the number as an argument and returns true if it is happy number else returns False.
  • Give the lower limit range and upper limit range as user input using map(),int(),split() functions.
  • Store them in two separate variables.
  • 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.
  • Loop from lower limit range to upper limit range using For loop.
  • Inside the for loop pass the iterator value to checkhapppynumb() function.
  • Inside the checkhapppynumb() function.
  • Take a variable reslt and initialize its value to the given argument.
  • 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 so return True
  • Else it is not a happy number so return False.
  • If it returns true then print the iterator value.
  • 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

# Create a function checkhapppynumb() which accepts the number as an argument
# and returns true if it is happy number else returns False.


def checkhapppynumb(numb):
    # Take a variable rest and initialize its value to the given argument.
    rest = numb
    # Loop till the rest is not equal to 1 or 4 using while loop.
    while(rest != 1 and rest != 4):
        # Inside the loop pass the reslt value to digitSquareSum()
        # and store it in the same variable reslt.
        rest = digitSquareSum(rest)
    # After the end of the while loop,
    # Check whether rest value is 1 or not using the If statement.
    if(rest == 1):
        # If it is true then the given number is a happy number so return True
        return True
    else:
        # Else it is not a happy number so return False.
        return False


# Give the lower limit range and upper limit range as
# user input using map(),int(),split() functions.
# Store them in two separate variables.
lowlimrange, upplimrange = map(int, input(
    'Enter lower limit range and upper limit range separate bt spaces = ').split())
print('The Harshad numbers in the given range',
      lowlimrange, 'and', upplimrange, 'are:')
print('The happy numbers in the given range',
      lowlimrange, 'and', upplimrange, 'are:')
# Loop from lower limit range to upper limit range using For loop.
for l in range(lowlimrange, upplimrange+1):
        # IInside the for loop pass the iterator value to checkhapppynumb() function.
    if(checkhapppynumb(l)):
        # If it returns true then print the iterator value.
        print(l, end=' ')

Output:

Enter lower limit range and upper limit range separate bt spaces = 333 444
The Harshad numbers in the given range 333 and 444 are:
The happy numbers in the given range 333 and 444 are:
338 356 362 365 367 368 376 379 383 386 391 392 397 404 409 440

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