hw4

YsGBt · YsGBt · commit a5eb61dec9f0 · 2022-04-04T16:26:06.000-07:00
diff --git a/src/main/java/homework/section4/FindFutureDate.java b/src/main/java/homework/section4/FindFutureDate.java
@@ -0,0 +1,46 @@
+package homework.section4;
+
+import java.util.Scanner;
+
+public class FindFutureDate {
+
+  public static void main(String[] args) {
+    Scanner input = new Scanner(System.in);
+    int todayDate, daysElapsed;
+    do {
+      System.out.print("Enter today's day: ");
+      todayDate = input.nextInt();
+    } while (todayDate > 6 || todayDate < 0);
+
+    System.out.print("Enter the number of days elapsed since today: ");
+    daysElapsed = input.nextInt();
+
+    int futureDay = todayDate + daysElapsed;
+    futureDay %= 7;
+    if (futureDay < 0) {
+      futureDay += 7;
+    }
+
+    System.out.println(
+        "Today is " + findDate(todayDate) + " and the future day is " + findDate(futureDay));
+  }
+
+  private static String findDate(int date) {
+    switch (date) {
+      case 0:
+        return "Sunday";
+      case 1:
+        return "Monday";
+      case 2:
+        return "Tuesday";
+      case 3:
+        return "Wednesday";
+      case 4:
+        return "Thursday";
+      case 5:
+        return "Friday";
+      default:
+        return "Saturday";
+    }
+  }
+}
diff --git a/src/main/java/homework/section4/ISBN.java b/src/main/java/homework/section4/ISBN.java
@@ -0,0 +1,26 @@
+package homework.section4;
+
+import java.util.Scanner;
+
+public class ISBN {
+
+  public static void main(String[] args) {
+    Scanner input = new Scanner(System.in);
+    System.out.print("Enter the first 9 digits of an ISBN as integer: ");
+    int first9Number = input.nextInt();
+
+    int copy = first9Number;
+    int lastNumber = 0;
+    for (int i = 9; i > 0; --i) {
+      lastNumber += (copy % 10) * i;
+      copy /= 10;
+    }
+    lastNumber %= 11;
+
+    if (lastNumber == 10) {
+      System.out.println("The ISBN-10 number is " + String.format("%09d", first9Number) + "%");
+    } else {
+      System.out.println("The ISBN-10 number is " + String.format("%09d", first9Number) + lastNumber);
+    }
+  }
+}
diff --git a/src/main/java/homework/section4/RandomMonth.java b/src/main/java/homework/section4/RandomMonth.java
@@ -0,0 +1,50 @@
+package homework.section4;
+
+import java.util.Random;
+
+public class RandomMonth {
+
+  public static void main(String[] args) {
+    Random r = new Random();
+    int randomNum = r.nextInt(12) + 1;
+    System.out.print("The number is: " + randomNum + ", which is ");
+    switch (randomNum) {
+      case 1:
+        System.out.println("January");
+        break;
+      case 2:
+        System.out.println("February");
+        break;
+      case 3:
+        System.out.println("March");
+        break;
+      case 4:
+        System.out.println("April");
+        break;
+      case 5:
+        System.out.println("May");
+        break;
+      case 6:
+        System.out.println("June");
+        break;
+      case 7:
+        System.out.println("July");
+        break;
+      case 8:
+        System.out.println("August");
+        break;
+      case 9:
+        System.out.println("September");
+        break;
+      case 10:
+        System.out.println("October");
+        break;
+      case 11:
+        System.out.println("November");
+        break;
+      case 12:
+        System.out.println("December");
+        break;
+    }
+  }
+}
diff --git a/src/main/java/homework/section4/RankNumber.java b/src/main/java/homework/section4/RankNumber.java
@@ -0,0 +1,35 @@
+package homework.section4;
+
+import java.util.Scanner;
+
+public class RankNumber {
+
+  public static void main(String[] args) {
+    Scanner input = new Scanner(System.in);
+    int one, two, three;
+    System.out.print("Please input the first number: ");
+    one = input.nextInt();
+    System.out.print("Please input the second number: ");
+    two = input.nextInt();
+    System.out.print("Please input the third number: ");
+    three = input.nextInt();
+
+    if (one > two) {
+      int temp = one;
+      one = two;
+      two = temp;
+    }
+    if (one > three) {
+      int temp = one;
+      one = three;
+      three = temp;
+    }
+    if (two > three) {
+      int temp = two;
+      two = three;
+      three = temp;
+    }
+
+    System.out.println("The rank is: " + one + ", " + two + ", " + three);
+  }
+}
