for Loops: Repeat! 🔁

Robots are great at doing the same thing again and again without getting bored. A for loop repeats code a set number of times:

Java

public class Main {
    public static void main(String[] args) {
        for (int i = 1; i <= 3; i++) {
            System.out.println("Planting seed " + i);
        }
    }
}

Prints:

Code

Planting seed 1
Planting seed 2
Planting seed 3

The three parts of a for loop

for (int i = 1; i <= 3; i++)

Part	Meaning
`int i = 1`	start: make a counter called i, starting at 1
`i <= 3`	keep going while this is true
`i++`	after each lap, add 1 to i

🚀 Counting down

Loops can count backwards too:

Java

public class Main {
    public static void main(String[] args) {
        for (int i = 5; i >= 1; i--) {
            System.out.print(i + " ");
        }
        System.out.println("Liftoff!");
    }
}

Prints 5 4 3 2 1 Liftoff!

Adding things up

A loop plus a variable can total things:

Java

public class Main {
    public static void main(String[] args) {
        int total = 0;
        for (int day = 1; day <= 7; day++) {
            total += 3; // 3 liters of water per day
        }
        System.out.println("Water this week: " + total + " liters");
    }
}

🐝 Fun fact

A honeybee may visit hundreds of flowers on a single trip. If a bee were a robot, its code would be one big loop: fly, find a flower, collect, repeat!

for Loops: Repeat!

for Loops: Repeat! 🔁

The three parts of a for loop

🚀 Counting down

Adding things up

🐝 Fun fact

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