2.3.5: Fireman Karel
In this task, we will be helping Karel, a robot firefighter, put out a fire in a given world. Karel will need to navigate through the world and extinguish all the fires by placing beepers on them.
The initial setup for Fireman Karel is as follows:
- Karel is located at the bottom left corner of the world, facing East.
- There are several fires spread throughout the world. The fires are represented by beepers.
- There are no obstacles between Karel and the fires.
To complete this task, follow these steps:
1. Start by writing a while loop that repeats until there are no more beepers in the world.
2. Inside the while loop, write another loop that makes Karel move forward until it encounters a wall. Use the `front_is_clear()` function to check if Karel can move forward.
3. Next, write a conditional statement to check if there is a beeper on the current location. Use the `beepers_present()` function for this check.
4. Inside the conditional statement, use the `pick_beeper()` function to pick up the beeper, simulating Karel extinguishing the fire.
5. After picking up the beeper, write an if-else statement to check Karel's direction. If Karel is facing East, turn it to face South using the `turn_right()` function. If Karel is facing South, turn it to face East using the `turn_left()` function.
6. Finally, write a loop that makes Karel move until it reaches the next empty corner. Use the `front_is_clear()` function to check if Karel can move forward.
7. After the loop, use conditional statements to check Karel's direction and rotate it accordingly. If Karel is facing East, turn it to face South using the `turn_right()` function. If Karel is facing South, turn it to face East using the `turn_left()` function.
8. Once the inner loop finishes, Karel should be at the next empty corner facing South. Inside the while loop, write the closing brace for the inner loop and a closing brace for the while loop.
9. Run the program and observe Karel extinguishing all the fires by placing beepers on them. If the program doesn't work properly, check for any possible mistakes in the logic or syntax.
By completing these steps, Karel will be able to navigate through the world and extinguish all the fires efficiently.
tell me the code urself
Certainly! Here's the code for Fireman Karel:
```python
def turn_right():
for i in range(3):
turn_left()
while beepers_present():
while front_is_clear():
move()
if beepers_present():
pick_beeper()
if facing_east():
turn_right()
else:
turn_left()
while front_is_clear():
move()
if facing_east():
turn_right()
else:
turn_left()
```
You can copy and paste this code into your Karel programming environment and run it to see Fireman Karel in action.
Fireman Karel refers to a programming task or exercise involving a virtual robot named Karel. Karel is a character used in teaching programming concepts, particularly in the context of introductory courses.
To understand the concept of Fireman Karel, you firstly need to know that Karel operates in a grid-like world. The world is made up of a series of streets and avenues, forming a rectangular grid. Karel can move around this grid and interact with objects present in the grid, such as beepers or walls.
In the Fireman Karel exercise, the goal is to program Karel to respond to fire emergencies and extinguish them. The world is represented by the grid, and Karel starts in a particular location within this grid. There may be fire present at certain locations, represented by beepers.
The challenge is to write a Karel program that makes Karel move to the location of the fire, pick up the beeper (indicating that the fire has been extinguished), and then move back to the starting position.
To solve this problem, you need to break it down into smaller steps and use a programming language or tool that supports Karel-like syntax. Here's a general approach for solving Fireman Karel:
1. Determine the starting position of Karel and its initial facing direction.
2. Write code to make Karel move forward until it reaches a cell with a beeper (indicating fire).
3. Once Karel reaches the location with the beeper, pick it up (indicating fire extinguished).
4. Write code to make Karel turn around 180 degrees to face in the opposite direction.
5. Write code to make Karel move back to the starting position.
6. Ensure that the program terminates once Karel reaches the starting position.
Each programming environment or tool might have its own syntax and functions to represent these steps. Some examples of programming languages or tools that support Karel-like syntax include Karel the Robot, Bee-Bot, or even custom implementations in Python, Java, or other languages.
By using the specific programming language or tool, and implementing the steps mentioned above, you can create a program that solves the Fireman Karel exercise and extinguishes fires in the virtual world.