Harkusha hw1

.gitignore

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+.idea
+out
+*.iml

src/Digits.java

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+/**
+ *  This class output a digit in verbal form.
+ */
+public class Digits {
+
+    // Array of digit's verbal form.
+    private static String[] digitArray = {
+            "zero",
+            "one",
+            "two",
+            "three",
+            "four",
+            "five",
+            "six",
+            "seven",
+            "eight",
+            "nine",
+    };
+
+            /**
+             *  Method make digit in verbal form.
+             *  @param digit - Digit for translate.
+             *  @return Answer with digit in digital and verbal forms.
+             */
+            public static void digitToString(int digit){
+                try{
+                    System.out.println("Your digit " + digit + " is " + digitArray[digit]);
+                }
+                catch(IndexOutOfBoundsException e){
+                    System.out.println("Your input is not a simple digit. Try use (0,...,9).");
+                                    }
+            }
+
+            public static void main(String argv[]){
+                // right use
+                digitToString(5);
+
+                //wrong use
+                digitToString(4566);
+            }
+}

src/Factorial.java

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+/**
+ *  This class calculates factorial of the number.
+ */
+public class Factorial {
+
+    /**
+     *  Not recursive method to calculates the factorial.
+     *  @param num - The number for calculates factorial.
+     *  @return factorialResult - Factorial for this number.
+     */
+    public static int factorialUnRecursive(long num) {
+        int factorialResult=1;
+
+        for (; num > 0; factorialResult *= num--);
+
+        return factorialResult;
+    }
+
+    /**
+     *  Recursive method to calculates the factorial.
+     *  @param num - The number for calculates factorial.
+     *  @return Factorial for this number.
+     */
+    public static int factorialRecursive(int num) {
+          return (num == 0) ? 1 : num * factorialRecursive(num - 1);
+    }
+
+
+    public static void main(String argv[]){
+        long factorialTest = 10;
+        System.out.println("Factorial " + factorialTest + " is " + factorialUnRecursive(factorialTest));
+
+        int factorialTest2 = 10;
+        System.out.println("Factorial " + factorialTest + " is " + factorialRecursive(factorialTest2));
+    }
+
+
+}
+
+

src/FibonacciRow.java

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+/**
+ *  This class calculates the number of the Fibonacci row.
+ */
+public class FibonacciRow {
+
+    /**
+     *  @param num - The number is less than that calculates Fibonacci row.
+     *  @return fibonacciResult - String with Fibonacci row.
+     */
+    public static String fibonacciRow(int num) {
+        String fibonacciResult = "";
+        int fibonacciNumber = 0;
+
+        for (int i = 1; i<num ; i=i+fibonacciNumber) {
+            fibonacciNumber+=i;
+            fibonacciResult = fibonacciResult + i + " ";
+            if (fibonacciNumber<num) {
+                fibonacciResult = fibonacciResult + fibonacciNumber + " ";
+            }
+        }
+
+        return fibonacciResult;
+    }
+
+    public static void main(String argv[]){
+        int fibonacciTest = 1000;
+        System.out.println("Fibonacci Row less than " + fibonacciTest + " is " + fibonacciRow(fibonacciTest));
+    }
+}