In this article, I will explore how to determine if a given digit is a three-digit number using Python programming. As a passionate programmer, I find this topic particularly interesting because it involves logic and problem-solving skills.

Before diving into the code, let’s understand the requirements. A three-digit number is any number between 100 and 999, inclusive. For example, 123, 456, and 789 are all three-digit numbers.

To solve this problem, we can use Python’s built-in functions and operators. The first step is to get the input from the user. We can use the input() function to prompt the user for a digit. Let’s consider the following code:

digit = int(input("Enter a digit: "))

In the above code, we use the input() function to read the user’s input as a string. Since we need to perform numerical operations, we convert the input to an integer using the int() function.

Now, let’s move on to the next step which is to check if the entered digit is a three-digit number. We can achieve this by using a combination of if-else statements and logical operators. Consider the following code:

if 100 <= digit <= 999:
print(f"{digit} is a three-digit number.")
else:
print(f"{digit} is not a three-digit number.")

In this code snippet, we use the if-else statement to evaluate the condition. If the condition "100 <= digit <= 999" is true, we print that the entered digit is a three-digit number. Otherwise, we print that it is not a three-digit number.

It's important to note that we use the logical operator <= (less than or equal to) to check if the digit is greater than or equal to 100, and the logical operator <= (greater than or equal to) to check if the digit is less than or equal to 999.

Let's see an example to better understand the concept:

Enter a digit: 456

456 is a three-digit number.

In the above example, when we enter the digit 456, the program evaluates the condition as true and prints that it is a three-digit number.

## Conclusion

In this article, we explored how to determine if a given digit is a three-digit number using Python programming. We learned how to use if-else statements and logical operators to solve this problem. By applying these concepts, we can easily check if a digit falls within the range of 100 to 999, and thus determine if it is a three-digit number.

Remember, programming is all about problem-solving and breaking down complex tasks into smaller, manageable steps. With practice and a curious mindset, you can tackle any coding challenge that comes your way!