Add the first exercices

Lecture.java

+import java.io.Reader;
+import java.util.Scanner;
+
+public class Lecture {
+
+	public static int askInt() {
+		Scanner rd = new Scanner(System.in);
+		int num = 0;
+		boolean run = true;
+
+		while (run) {
+			System.out.print("Entrez une valeur entière :");
+			try {
+				num = rd.nextInt();
+				run = false;
+			} catch (Exception e) {
+				System.out.println("Valeur erronée");
+				rd.next();
+			}
+		}
+		// rd.close();
+		return num;
+	}
+
+	public static int askIntRec() {
+
+		Scanner sc = new Scanner(System.in);
+		int num = 0;
+
+		System.out.print("Entrez une valeur entière :");
+		try {
+			num = sc.nextInt();
+			sc.close();
+		} catch (Exception e) {
+			System.out.println("Valeur erronée");
+			sc.next();
+			num = askIntRec();
+		}
+		return num;
+	}
+
+	public static void main(String[] args) {
+		System.out.println("Le méthode a retourné " + askInt());
+		System.out.println("Le méthode a retourné " + askIntRec());
+	}
+}
\ No newline at end of file

Serie1.java

+import java.lang.Math;
+import java.io.Reader;
+import java.util.Scanner;
+
+import javax.lang.model.util.ElementScanner14;
+
+public class Serie1 {
+	public static void whileTests(int i) {
+		do {
+			System.out.println(i++);
+		} while (i < 5);
+	}
+
+	static void g(int n, float x) {
+		System.out.println(x);
+	}
+
+	static void printTriangle(int n) {
+		for (int i = 1; i < n + 1; i++) {
+			for (int j = 0; j < i; j++) {
+				System.out.print("*");
+			}
+			System.out.println();
+		}
+	}
+
+	static void printSapin(int h) {
+		for (int i = 1; i < h + 1; i++) {
+			for (int j = 0; j < h - i; j++) {
+				System.out.print(" ");
+			}
+			for (int x = 0; x < i * 2 - 1; x++) {
+				System.out.print("*");
+			}
+			System.out.println();
+		}
+	}
+
+	static double GetPi(int n) {
+
+		double sum = 0.0;
+		for (int i = 1; i < n; i++) {
+			sum += 1.0 / (i * i * i * i);
+		}
+
+		return Math.pow(sum * 90.0, 1.0 / 4.0);
+	}
+
+	public static void Serpent() {
+		Scanner rd = new Scanner(System.in);
+		String head = "(^^)";
+
+		boolean run = true;
+		int size = 0;
+		while (run) {
+			System.out.println("*".repeat(size) + head);
+			switch (rd.next()) {
+				case "+":
+					size++;
+					System.out.println("DEBUG");
+					break;
+				case "-":
+					if (size > 0) {
+						size--;
+					} else {
+						run = false;
+					}
+					break;
+			}
+
+		}
+
+		rd.close();
+
+	}
+
+	public static void main(String[] args) {
+		// whileTests(0);
+		// g(10, 10);
+		// printTriangle(4);
+		// printSapin(4);
+		// System.out.println((GetPi(100)));
+		Serpent();
+	}
+}
\ No newline at end of file

Vecteur.java

+public class Vecteur {
+
+	public static double[] Add(double[] a, double[] b) {
+		if (a.length != b.length)
+			return new double[0];
+
+		double[] out = new double[a.length];
+
+		for (int i = 0; i < a.length; i++) {
+			out[i] = a[i] + b[i];
+		}
+
+		return out;
+	}
+
+	public static double[] mul(double[] a, double b) {
+
+		for (int i = 0; i < a.length; i++) {
+			a[i] = a[i] * b;
+		}
+
+		return a;
+	}
+
+}