double divide(double a, double b) {
    return a / b;
}

void main() {
    IO.println(divide(10, 2));

    double divisor = 0;
    if (divisor != 0) {
        IO.println(divide(10, divisor));
    } else {
        IO.println("Cannot divide by zero.");
    }
}

// From Groundwork, chapter 6 (ch06-methods), box 9.
// This example is from Groundwork, licensed CC BY-NC-SA 4.0.
// Run with: java ch06_09.java