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

February 21, 2022, Learn eTutorial
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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 the python program to check a number is a happy number for more details. 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 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 if the returned value from the function is one or not. If it is a 1, then `print` that number, because it is 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 remainder as zero

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

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

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
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 ```

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