Update solutions

Author: Sven97

src/Chapter05/Exercise0549_Count_vowels_and_consonants.java

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+/**
+ * (Count vowels and consonants) Assume that the letters A, E, I, O, and U are vowels.
+ * Write a program that prompts the user to enter a string, and displays the number of
+ * vowels and consonants in the string.
+ *
+ * Enter a string: Programming is fun
+ * The number of vowels is 5
+ * The number of consonants is 11
+ *
+ * Created by Sven on 06/10/19.
+ */
+package Chapter05;
+
+import java.util.Scanner;
+
+public class Exercise0549_Count_vowels_and_consonants {
+    public static void main(String[] args) {
+        Scanner input = new Scanner(System.in);
+        System.out.print("Enter a string: ");
+        String str = input.nextLine();
+
+        int numOfVow = 0, numOfCon = 0;
+
+        for (int i = 0; i < str.length(); i++) {
+            char ch = str.charAt(i);
+
+            if (ch == 'A' || ch == 'E' || ch == 'I' || ch == 'O' || ch == 'U' ||
+                    ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u') {
+                numOfVow++;
+            } else if ((ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z')) {
+                numOfCon++;
+            }
+        }
+        System.out.println("The number of vowels is " + numOfVow);
+        System.out.println("The number of consonants is " + numOfCon);
+    }
+}
+

src/Chapter05/Exercise0550_Print_multiplication_table.java

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+/**
+ * (Print multiplication table) Write a program that uses for, while, and do-while loop
+ * statements to display the multiplication table. Here is a sample run:
+ *
+ * Enter a string: Welcome to Java
+ * 1*1= 1 2*1= 2 3*1= 3 4*1= 4 5*1= 5 6*1= 6 7*1= 7 8*1= 8 9*1= 9
+ * 1*2= 1 2*2= 2 3*2= 6 4*2= 8 5*2=10 6*2=12 7*2=14 8*2=16 9*2=18
+ * 1*3= 3 2*3= 6 3*3= 9 4*3=12 5*3=15 6*3=18 7*3=21 8*3=24 9*3=27
+ * 1*4= 4 2*4= 8 3*4=12 4*4=16 5*4=20 6*4=24 7*4=28 8*4=32 9*4=36
+ * 1*5= 5 2*5=10 3*5=15 4*5=20 5*5=25 6*5=30 7*5=35 8*5=40 9*5=45
+ * 1*6= 6 2*6=12 3*6=18 4*6=24 5*6=30 6*6=36 7*6=42 8*6=48 9*6=54
+ * 1*7= 7 2*7=14 3*7=21 4*7=28 5*7=35 6*7=42 7*7=49 8*7=56 9*7=63
+ * 1*8= 8 2*8=16 3*8=24 4*8=32 5*8=40 6*8=48 7*8=56 8*8=64 9*8=72
+ * 1*9= 9 2*9=18 3*9=27 4*9=36 5*9=45 6*9=54 7*9=63 8*9=72 9*9=81
+ *
+ * Created by Sven on 06/10/19.
+ */
+package Chapter05;
+
+import java.util.Scanner;
+
+public class Exercise0550_Print_multiplication_table {
+    public static void main(String[] args) {
+        Scanner input = new Scanner(System.in);
+        System.out.print("Enter a string: ");
+        String str = input.nextLine();
+
+        // for loop
+        System.out.println("\nPrint multiplication table using for loop");
+        for (int i = 1; i < 10; i++) {
+            for (int j = 1; j < 10; j++) {
+                System.out.printf("%d*%d=%2d ", i, j, i * j);
+            }
+            System.out.println();
+        }
+
+        // do-while loop
+        System.out.println("\nPrint multiplication table using while loop");
+        int i = 1, j = 1;
+        while (i < 10) {
+            while (j < 10) {
+                System.out.printf("%d*%d=%2d ", i, j, i * j);
+                j++;
+            }
+            System.out.println();
+            i++;
+            j = 1;
+        }
+
+
+        // do-while loop
+        System.out.println("\nPrint multiplication table using do-while loop");
+        i = 1;
+        j = 1;
+        do {
+            do {
+                System.out.printf("%d*%d=%2d ", i, j, i * j);
+                j++;
+            } while (j < 10);
+            System.out.println();
+            i++;
+            j = 1;
+        } while (i < 10);
+    }
+}

src/Chapter05/Exercise0551_Longest_common_prefix.java

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+/**
+ * (Longest common prefix) Write a program that prompts the user to enter two
+ * strings and displays the largest common prefix of the two strings. Here are some
+ * sample runs:
+ *
+ * Enter the first string: Welcome to C++
+ * Enter the second string: Welcome to programming
+ * The common prefix is Welcome to
+ *
+ * Enter the first string: Atlanta
+ * Enter the second string: Macon
+ * Atlanta and Macon have no common prefix
+ *
+ * Created by Sven on 06/10/19.
+ */
+package Chapter05;
+
+import java.util.Scanner;
+
+public class Exercise0551_Longest_common_prefix {
+    public static void main(String[] args) {
+        Scanner input = new Scanner(System.in);
+
+        System.out.print("Enter the first string: ");
+        String firstStr = input.nextLine();
+
+        System.out.print("Enter the second string: ");
+        String secondStr = input.nextLine();
+
+        String commonPrefix = "";
+
+        int minLen = (firstStr.length() <= secondStr.length()) ? firstStr.length() : secondStr.length();
+        for (int i = 0; i < minLen; i++) {
+            if (firstStr.charAt(i) == secondStr.charAt(i)) {
+                commonPrefix += firstStr.charAt(i);
+            } else {
+                break;
+            }
+        }
+
+        if (commonPrefix.length() == 0) {
+            System.out.println(firstStr + " and " + secondStr + " have no common prefix");
+        } else {
+            System.out.println("The common prefix is " + commonPrefix);
+        }
+    }
+}