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Chapter 3: Problem 19

Write an if statement that displays the message "The number is not valid" if the variable speed is outside the range 0 through 200.

Short Answer

Expert verified
Question: Write an if statement to check whether the value of the variable "speed" is within the valid range (0 to 200) or not, displaying a message if it is not valid. Answer: The appropriate if statement will check if the value of "speed" is within the valid range of 0 to 200, and if not, will display the message "The number is not valid". Here's an example of the if-else statement to solve this problem: ```python speed = #your_value# if 0 <= speed <= 200: pass # do nothing else: print("The number is not valid") ``` Replace "#your_value#" with the appropriate value for speed.

Step by step solution

01

Identify the variable

The problem mentions a variable named "speed". This will be our input variable for which we need to check if it falls within the valid range.
02

Compose the condition

Since the valid range is between 0 and 200 (inclusive), the condition must check two things: whether the speed is greater than or equal to 0 and whether it's less than or equal to 200. We can use the 'and' operator to combine these two conditions.
03

Write the if statement

If the condition is met, that means the value of speed is within the valid range. However, we need to write an action for when the value is NOT within the valid range. In this case, we'll display the message "The number is not valid". To do this, we'll use the "else" or "otherwise" part of the conditional statement.
04

Example code snippet

Here's an example of an if-else statement in Python that meets the requirements of this problem (change to other programming languages as needed): ``` speed = #your_value# if 0 <= speed <= 200: pass # do nothing else: print("The number is not valid") ``` Replace "#your_value#" with the appropriate value for speed.

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