Introduction

⚠️ Before starting this quest, you must have finished the following quests:

Reminder : A loop allows to repeat an instruction a number of times, according to a condition.

1. Initialization of a counter
2. Check if condition is still true
3. If so, execute the code inside curly brackets. Else the loop ends and following steps are skipped.
4. Update value of counter
5. Restart to step 2 (while condition is true)

Source: hexainclude

💪 Challenge

Exercise 1 : planting trees 🌳

• Write a loop to plant 3 trees (you should display '🌳🌳🌳').
• Write a loop to plant 8 🌳 .
• Write a loop to plant 20 🌳 .

Exercise 2 : planting more trees 🌲🌴

In previous exercise, you can plant one 🌳 per hour. So in a loop of 8, you plant 8 🌳, easy. Now, you have to plant 🌲, they are more delicate and need to dig deeper. You need 2 hours to plant a 🌲.

Hint: you shouldn't calculate the amount of trees planted before but have the loop do it for you. Probably using a $numberOfHours counter

• Write a loop to plant 🌲 during a 6 hours working day.
• Write a loop to plant 🌲 during a 8 hours working day.
• Write a loop to plant 🌲 during a 9 hours working day.

You have now experience in tree planting. You work now with very delicate and rare tree 🌴. You need 3 hours of work to plant one 🌴.

• Write a loop to plant 🌴 during a 6 hours working day.
• Write a loop to plant 🌴 during a 2 hours working day.
• Write a loop to plant 🌴 during a 8 hours working day.

Exercise 3 : planting a forest

You know how to plant a row of trees 🌳🌳🌳🌳🌳🌳🌳🌳🌳. But you see bigger, and you want now to plant a whole forest.

• Using 2 nested loops (yes, you can use a loop inside another loop, it's crazy!), display a forest of 8 columns and 3 rows. Use PHP_EOL to create new lines. You should obtain 🌳🌳🌳🌳🌳🌳🌳🌳 🌳🌳🌳🌳🌳🌳🌳🌳 🌳🌳🌳🌳🌳🌳🌳🌳

• Bigger now ! Display a forest of 40 columns and 25 rows. You can also use 2 variables to determine the forest width and height. The loops should reflect the values of these variables.

• Create a forest of 10 columns and 5 rows, with alternate types of trees in each row, as below. (Hint: use modulo operator % to determine if you have a odd or even value)

🌳🌳🌳🌳🌳🌳🌳🌳🌳🌳 🌲🌲🌲🌲🌲🌲🌲🌲🌲🌲 🌳🌳🌳🌳🌳🌳🌳🌳🌳🌳 🌲🌲🌲🌲🌲🌲🌲🌲🌲🌲 🌳🌳🌳🌳🌳🌳🌳🌳🌳🌳

• Create a forest of 7 columns and 8 rows, with alternate types of trees in each column 🌳🌲🌳🌲🌳🌲🌳 🌳🌲🌳🌲🌳🌲🌳 🌳🌲🌳🌲🌳🌲🌳 🌳🌲🌳🌲🌳🌲🌳 🌳🌲🌳🌲🌳🌲🌳 🌳🌲🌳🌲🌳🌲🌳 🌳🌲🌳🌲🌳🌲🌳 🌳🌲🌳🌲🌳🌲🌳

Exercise 4 : planting triangle forest

You can not always plant rectangle shape forest.

• Create loops to display this triangle shape forest (one more 🌳 in each new line). 🌳 🌳🌳 🌳🌳🌳 🌳🌳🌳🌳 🌳🌳🌳🌳🌳

• Create loops to display this other triangle shape forest (from largest to shortest line). 🌳🌳🌳🌳🌳 🌳🌳🌳🌳 🌳🌳🌳 🌳🌳 🌳

🧐 Acceptance criteria

• [ ] All the trees are correctly displayed
• [ ] You have understand how to use simple loops
• [ ] You have understand how to nest two loops to solve more complex problems.