initial lab1

12 files changed, 257 insertions, 1 deletions

diff --git a/src/se/liu/gusso230/lab1/Exercise1.java b/src/se/liu/gusso230/lab1/Exercise1.java
new file mode 100644
index 0000000..12e765f
--- /dev/null
+++ b/src/se/liu/gusso230/lab1/Exercise1.java
@@ -0,0 +1,7 @@
+package se.liu.gusso230.lab1;
+
+public class Exercise1 {
+    public static void main(String[] args) {
+        System.out.println("Hello, World!");
+    }
+}
diff --git a/src/se/liu/gusso230/lab1/Exercise10.java b/src/se/liu/gusso230/lab1/Exercise10.java
new file mode 100644
index 0000000..55331c6
--- /dev/null
+++ b/src/se/liu/gusso230/lab1/Exercise10.java
@@ -0,0 +1,44 @@
+package se.liu.gusso230.lab1;
+
+public class Exercise10 {
+    public static void main(String[] args) {
+	{
+	    int number = 16777216;
+	    float decimal = number;
+	    int integerAgain = (int) decimal;
+	    System.out.println(number + " => " + decimal + " => " + integerAgain);
+	}
+	{
+	    int number = 16777217;
+	    float decimal = number;
+	    int integerAgain = (int) decimal;
+	    System.out.println(number + " => " + decimal + " => " + integerAgain);
+	}
+	{
+	    int number = 16777217;
+	    double decimal = number;
+	    int integerAgain = (int) decimal;
+	    System.out.println(number + " => " + decimal + " => " + integerAgain);
+	}
+	{
+	    int big = 2147483647;
+	    int bigger = big + 1;
+	    System.out.println(big + ", " + bigger);
+	}
+	{
+	    int big = 2147483647;
+	    long bigger = big + 1;
+	    System.out.println(big + ", " + bigger);
+	}
+	{
+	    int big = 2147483647;
+	    long bigger = big + 1L;
+	    System.out.println(big + ", " + bigger);
+	}
+	{
+	    int big = 2147483647;
+	    long bigger = (long) big + 1;
+	    System.out.println(big + ", " + bigger);
+	}
+    }
+}
diff --git a/src/se/liu/gusso230/lab1/Exercise2.java b/src/se/liu/gusso230/lab1/Exercise2.java
new file mode 100644
index 0000000..1af92a4
--- /dev/null
+++ b/src/se/liu/gusso230/lab1/Exercise2.java
@@ -0,0 +1,29 @@
+package se.liu.gusso230.lab1;
+
+public class Exercise2 {
+    public static void main(String[] args) {
+        final int min = 10;
+        final int max = 20;
+
+        System.out.println(sumFor(min, max));
+        System.out.println(sumWhile(min, max));
+    }
+
+    public static int sumFor(int min, int max) {
+        int res = 0;
+        for (int i = min; i <= max; i++) {
+            res += i;
+        }
+        return res;
+    }
+
+    public static int sumWhile (int min, int max) {
+        int res = 0;
+        int i = min;
+        while (i <= max) {
+            res += i;
+            i++;
+        }
+        return res;
+    }
+}
diff --git a/src/se/liu/gusso230/lab1/Exercise3.java b/src/se/liu/gusso230/lab1/Exercise3.java
new file mode 100644
index 0000000..e89e9b4
--- /dev/null
+++ b/src/se/liu/gusso230/lab1/Exercise3.java
@@ -0,0 +1,11 @@
+package se.liu.gusso230.lab1;
+
+public class Exercise3 {
+    private final static int TABELL = 5;
+
+    public static void main(String[] args) {
+        for (int i = 1; i <= 12; i++) {
+            System.out.println(i + " * " + TABELL + " = " + i * TABELL);
+        }
+    }
+}
diff --git a/src/se/liu/gusso230/lab1/Exercise4.java b/src/se/liu/gusso230/lab1/Exercise4.java
new file mode 100644
index 0000000..9b9bb42
--- /dev/null
+++ b/src/se/liu/gusso230/lab1/Exercise4.java
@@ -0,0 +1,13 @@
+package se.liu.gusso230.lab1;
+
+import javax.swing.*;
+
+public class Exercise4 {
+    public static void main(String[] args) {
+        String input = JOptionPane.showInputDialog("Please input a value");
+        int tabell = Integer.parseInt(input);
+        for (int i = 1; i <= 12; i++) {
+            System.out.println(i + " * " + tabell + " = " + i * tabell);
+        }
+    }
+}
diff --git a/src/se/liu/gusso230/lab1/Exercise5.java b/src/se/liu/gusso230/lab1/Exercise5.java
new file mode 100644
index 0000000..6507039
--- /dev/null
+++ b/src/se/liu/gusso230/lab1/Exercise5.java
@@ -0,0 +1,23 @@
+package se.liu.gusso230.lab1;
+
+public class Exercise5 {
+    public static void main(String[] args) {
+	for (int i = 0; i <= 10; i++) {
+	    System.out.println(i + "-fakultet: " + factorial(i));
+	}
+    }
+
+    /**
+     * Calculates f! given f.
+     * @param f
+     * @return f!
+     */
+    private static int factorial(int f) {
+	int result = 1;
+	for (int i = 1; i <= f; i++) {
+	    result *= i;
+	}
+
+	return result;
+    }
+}
diff --git a/src/se/liu/gusso230/lab1/Exercise6.java b/src/se/liu/gusso230/lab1/Exercise6.java
new file mode 100644
index 0000000..b4b0480
--- /dev/null
+++ b/src/se/liu/gusso230/lab1/Exercise6.java
@@ -0,0 +1,19 @@
+package se.liu.gusso230.lab1;
+
+public class Exercise6 {
+    public static void main(String[] args) {
+        for (int i = 2; i < 100; i++) {
+            System.out.println(i + ": " + (isPrime(i) ? "prime" : "not prime"));
+        }
+    }
+
+    public static boolean isPrime(int number) {
+        for (int i = 2; i < number; i++) {
+            int rest = number % i;
+            if (rest == 0) {
+                return false;
+            }
+        }
+        return true;
+    }
+}
diff --git a/src/se/liu/gusso230/lab1/Exercise7.java b/src/se/liu/gusso230/lab1/Exercise7.java
new file mode 100644
index 0000000..d90bb89
--- /dev/null
+++ b/src/se/liu/gusso230/lab1/Exercise7.java
@@ -0,0 +1,42 @@
+package se.liu.gusso230.lab1;
+
+import javax.swing.*;
+
+public class Exercise7 {
+    public static void main(String[] args) {
+        final int min = 10;
+        final int max = 20;
+
+        String res = JOptionPane.showInputDialog("for or while?");
+        switch (res) {
+            case "for":
+                System.out.println(sumFor(min, max));
+                break;
+            case "while":
+                System.out.println(sumWhile(min, max));
+                break;
+            default:
+                System.out.println("Has to be either for or while");
+                break;
+        }
+
+    }
+
+    public static int sumFor(int min, int max) {
+        int res = 0;
+        for (int i = min; i <= max; i++) {
+            res += i;
+        }
+        return res;
+    }
+
+    public static int sumWhile (int min, int max) {
+        int res = 0;
+        int i = min;
+        while (i <= max) {
+            res += i;
+            i++;
+        }
+        return res;
+    }
+}
diff --git a/src/se/liu/gusso230/lab1/Exercise8.java b/src/se/liu/gusso230/lab1/Exercise8.java
new file mode 100644
index 0000000..58236ca
--- /dev/null
+++ b/src/se/liu/gusso230/lab1/Exercise8.java
@@ -0,0 +1,21 @@
+package se.liu.gusso230.lab1;
+
+import javax.swing.*;
+
+public class Exercise8 {
+    public static void main(String[] args) {
+        while (true) {
+            if (askUser("Quit?") && askUser("Really?")) {
+                return;
+            }
+
+            // if (askUser("Quit?") & askUser("Really?")) {
+            //     return;
+            // }
+        }
+    }
+
+    public static boolean askUser(String question) {
+        return JOptionPane.showConfirmDialog(null, question, "", JOptionPane.YES_NO_OPTION) == JOptionPane.YES_OPTION;
+    }
+}
diff --git a/src/se/liu/gusso230/lab1/Exercise9.java b/src/se/liu/gusso230/lab1/Exercise9.java
new file mode 100644
index 0000000..a8809a8
--- /dev/null
+++ b/src/se/liu/gusso230/lab1/Exercise9.java
@@ -0,0 +1,18 @@
+package se.liu.gusso230.lab1;
+
+import javax.swing.*;
+
+public class Exercise9 {
+    public static void main(String[] args) {
+        String input = JOptionPane.showInputDialog("Please input a value");
+	System.out.println("sqrt (" + input + ") ~= " + findRoot(Double.parseDouble(input)));
+    }
+
+    public static double findRoot(double d) {
+        double guess = d;
+        for (int i = 0; i < 10; i++) {
+            guess -= (guess * guess - d) / (2 * guess);
+        }
+        return guess;
+    }
+}
diff --git a/src/se/liu/gusso230/lab1/Person.java b/src/se/liu/gusso230/lab1/Person.java
new file mode 100644
index 0000000..e8bbb79
--- /dev/null
+++ b/src/se/liu/gusso230/lab1/Person.java
@@ -0,0 +1,30 @@
+package se.liu.gusso230.lab1;
+
+import java.time.LocalDate;
+import java.time.Period;
+
+public class Person {
+    private String name;
+    private LocalDate birthDay;
+
+    public Person(String name, LocalDate birthDay) {
+        this.name = name;
+        this.birthDay = birthDay;
+    }
+
+    public int getAge() {
+        return Period.between(birthDay, LocalDate.now()).getYears();
+    }
+
+    @Override
+    public String toString() {
+        return name + " " + getAge();
+    }
+
+    public static void main(String[] args) {
+        Person me = new Person("GS", LocalDate.of(2000, 11, 1));
+        Person brother = new Person("AS", LocalDate.of(2003, 3, 14));
+        System.out.println(me);
+        System.out.println(brother);
+    }
+}
diff --git a/src/se/liu/liuid123/.gitkeep b/src/se/liu/liuid123/.gitkeep
deleted file mode 100644
index f2a87fc..0000000
--- a/src/se/liu/liuid123/.gitkeep
+++ /dev/null
@@ -1 +0,0 @@
-This file makes sure the folder does not disappear from Git if it becomes empty.
\ No newline at end of file