Python Program to display happy numbers between the range 1 and 100

In this simple python program, we have to display happy numbers in between a range. It's a beginner-level python program.

To understand this example, you should have knowledge of the following Python programming topics:

How to print happy numbers between a range in python?

In this beginner python program example, We already discuss the happy number in our previous program. (please refer to that python program for more). Just an introduction to what is a happy number is A number in which the sum of the square of its digits which we were doing it continuously for every result till we get a resultant 1. else it's not a happy number.

In this basic python program, we need to print the happy numbers between 1 and 100. so We need to check every number between 1 and 100 as a happy number or not using if condition in python. If that is a happy number, we print that number else; we move to the next number.

In this simple python program, we use a for loop starting from 1 to 100 using the range method in python programming language and then store that number to a variable and for each number in that for loop, open a while loop till the result from the user-defined function is not equal to 1 or 4, inside that while loop we call the function to calculate the sum. And we check that the returned value from the function is one or not. If it is a 1, then print that number as a Happy number.

ALGORITHM

STEP 1: Print a message as the happy numbers are using print statements in python language.

STEP 2: Open a for loop from 1 to 100 using the range method to check every number for a happy number or not.

STEP 3: Assign or copy the number to a variable.

STEP 4: Open a while loop till the return value from the user-defined function is not equal to 1 and 4.

STEP 5: Call the function to calculate the sum of the square of the number until we get a resultant.

STEP 6: Check the result is equal to zero using an if condition in python language. Then if so, print that number else iterate the next number using for loop. we use a space character in between every happy number in printing

User-Defined Function isHNumber(num)

STEP 1: Define the function and get the parameters from the main program.

STEP 2: Initialize two variables for sum and reminder as zero

STEP 3: Open a while loop until the number is greater than zero.

STEP 4: Get the reminder of the number using a mod operator and add the sum is sum + square of the reminder.

STEP 5: Divide the number by 10 to split the number and get the next digit.

STEP 6: Return the sum to the main program using python syntax.

Python Source Code

                                          def hnum(num):
   rem = sum = 0
   while(num > 0):
      rem = num%10
      sum = sum + (rem*rem)
      num = num//10
   return sum
print("Happy numbers between range 1 and 100 are: ")
for i in range(1, 101):
   result = i
   while(result != 1 and result != 4):
      result = hnum(result)
   if(result == 1):
      print(i)
                                      

OUTPUT

Happy numbers between range 1 and 100 are

1  7  10  13  19  23  28  31  32  44  49  68  70  79  82  86  91  94  97  100