Prompt Olivia to input a number and use "If" statements to check if the number is divisible by 3 or not. Display an appropriate message based on the result.

Here is a step-by-step guide on how to write a program that prompts a user to input a number and checks if the number is divisible by 3 or not using "If" statements. This guide is written in Python.

1. First, you need to prompt the user to input a number. You can use the input() function in Python to do this. The input() function allows you to take user input as a string. Here is how you can do it:

number = input("Please enter a number: ")

2. The input() function returns a string, so you need to convert this string to an integer before you can perform any mathematical operations on it. You can use the int() function in Python to convert a string to an integer:

number = int(input("Please enter a number: "))

3. Now that you have the number, you can check if it is divisible by 3 or not. In Python, you can use the modulus operator % to find the remainder of a division operation. If a number is divisible by 3, the remainder of the division operation will be 0. Here is how you can do it:

if number % 3 == 0:
    print("The number is divisible by 3.")
else:
    print("The number is not divisible by 3.")

So, the complete program looks like this:

number = int(input("Please enter a number: "))

if number % 3 == 0:
    print("The number is divisible by 3.")
else:
    print("The number is not divisible by 3.")

This program will prompt the user to enter a number, and then it will display a message indicating whether the number is divisible by 3 or not.