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Iteration

L1

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Iteration1.java
import org.pureprogrammer.Utils;

public class Iteration1 {

	public static void main(String[] args) {
		int max = 5;
		if (args.length == 1) {
			max = Utils.stoiWithDefault(args[0], 5);
		}
		for (int i = 0; i < max; ++i) {
			System.out.println("Hello, world!");
		}
	}
}
Output
$ javac -Xlint Iteration1.java $ java -ea Iteration1 5 Hello, world! Hello, world! Hello, world! Hello, world! Hello, world!
Iteration2.java
public class Iteration2 {

	public static void main(String[] args) {
		for (int i = 10; i >= 1; --i) {
			System.out.println(i);
		}
		System.out.println("Blastoff!");
	}
}
Output
$ javac -Xlint Iteration2.java $ java -ea Iteration2 10 9 8 7 6 5 4 3 2 1 Blastoff!
Iteration3.java
public class Iteration3 {

	public static void main(String[] args) {
		System.out.println("Even numbers up to 100...");
		for (int i = 2; i <= 100; i += 2) {
			System.out.println(i);
		}
	}
}
Output
$ javac -Xlint Iteration3.java $ java -ea Iteration3 Even numbers up to 100... 2 4 6 8 10 12 14 16 18 ... 82 84 86 88 90 92 94 96 98 100
Iteration4.java
public class Iteration4 {

	public static void main(String[] args) {
		System.out.println("Floating point numbers");
		for (double d = 1.0; d < 2.01; d += 0.1) {
			System.out.println(d);
		}
	}
}
Output
$ javac -Xlint Iteration4.java $ java -ea Iteration4 Floating point numbers 1.0 1.1 1.2000000000000002 1.3000000000000003 1.4000000000000004 1.5000000000000004 1.6000000000000005 1.7000000000000006 1.8000000000000007 1.9000000000000008 2.000000000000001
Iteration5.java
public class Iteration5 {

	public static void main(String[] args) {
		System.out.println("Powers of 2 up to 256!");
		for (int i = 1; i <= 256; i *= 2) {
			System.out.println(i);
		}
	}
}
Output
$ javac -Xlint Iteration5.java $ java -ea Iteration5 Powers of 2 up to 256! 1 2 4 8 16 32 64 128 256
Iteration6.java
import org.pureprogrammer.Utils;

public class Iteration6 {

	public static void main(String[] args) {
		String s = "Hello, world! 🥰🇺🇸";
		for (String c : new Utils.StringCodepointsIterable(s)) {
			System.out.println(c);
		}
	}
}
Output
$ javac -Xlint Iteration6.java $ java -ea Iteration6 H e l l o , w o r l d ! 🥰 🇺 🇸

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