Challenge, tests, input file, etc. are setup.

spring24/week4/Challenge.java

@@ -10,15 +10,15 @@ public class Challenge {
 	
 	/**
 	 * CHALLENGE 1:
-	 * Read and store the contents of a file into a String array for further processing.
+	 * Read and store the contents of a file into a String or other type for further processing.
 	 * 
 	 * @param f
 	 * @return
 	 */
-	public static String[] readFile(File f) {
+	public static String readFile(File f) {
 		if(f == null) return null; // Catch if the File does not exist.
 		
-		// TODO: Create a variable, potentially an object, to store Strings that are read in from the file.
+		// TODO: Create a variable, potentially an object like ArrayList or StringBuilder or even the humble String, to store Strings that are read in from the file.
 		
 		try (Scanner s = new Scanner(f)){
 			// TODO: Populate the variable from above with Strings from the file.
@@ -26,19 +26,21 @@ public class Challenge {
 			e.printStackTrace();
 		}
 		
+		// TODO: Convert your variable to a String variable.
+		
 		return null; // TODO: Return the variable.
 	}
 	
 	/**
 	 * CHALLENGE 2:
-	 * Given an input String array, store each token in an ArrayList.
+	 * Given an input String, store each token in an ArrayList.
 	 * 
 	 * A token is a single word, symbol, or character, surrounded on both sides by a space.
 	 * 
 	 * @param s
 	 * @return
 	 */
-	public static ArrayList<String> split(String[] s) {
+	public static ArrayList<String> split(String s) {
 		ArrayList<String> list = new ArrayList<String>();
 		
 		// TODO: Take the input String array s and add each separate word (separated by a space) to the ArrayList.
@@ -49,7 +51,8 @@ public class Challenge {
 	/**
 	 * CHALLENGE 3:
 	 * Given an input ArrayList of tokens (assume all are valid integers, doubles, or operations ('+','-','*','/','%','(', and ')')),
-	 * calculate the result using correct order of operations.
+	 * calculate the result using correct order of operations. The output should only contain 4 decimal places, rounding up if the 5th place
+	 * is greater than 5.
 	 * 
 	 * HINT: Think of a data structure that might be useful for this.
 	 * 
@@ -59,19 +62,68 @@ public class Challenge {
 		return 0.0; // TODO: Implement this method.
 	}
 	
-	public static boolean testChallenge1(String[] s) {
-		return false; // TODO
+	public static boolean testChallenge1(String s) {
+		return s.equals("( ( 5 + 5 ) * 5 * 3 ) / ( 5 * 3 + ( 8 * 4 ) )");
 	}
 	
 	public static boolean testChallenge2(ArrayList<String> list) {
-		return false; // TODO
+		// Don't do this to answer Challenge 2. This is the only way to not give away a solution.
+		ArrayList<String> expected = new ArrayList<>();
+			expected.add("(");
+			expected.add("(");
+			expected.add("5");
+			expected.add("+");
+			expected.add("5");
+			expected.add(")");
+			expected.add("*");
+			expected.add("5");
+			expected.add("*");
+			expected.add("3");
+			expected.add("/");
+			expected.add("(");
+			expected.add("5");
+			expected.add("*");
+			expected.add("3");
+			expected.add("+");
+			expected.add("(");
+			expected.add("8");
+			expected.add("*");
+			expected.add("4");
+			expected.add(")");
+			expected.add(")");
+			
+		if(expected.size() != list.size()) {
+			System.out.println("Your solution for Challenge 2 does not correctly tokenize! You have too few or too many elements.");
+			return false;
+		}
+			
+		for(int i = 0; i < expected.size(); i++)
+			if(!(expected.get(i).equals(list.get(i)))) {
+				System.out.println("Your solution for Challenge 2 does not correctly tokenize! At index " + i + " (and maybe others) your output does not match the expected output.");
+				return false;
+			}
+		
+		return true;
 	}
 	
 	public static boolean testChallenge3(double result) {
-		return false; // TODO
+		return result == 3.1915;
 	}
 	
+	// Test driver for the three coding challenges.
 	public static void main(String[] args) {
+		File f = new File("Example.txt");
+		String s = readFile(f);
+		ArrayList<String> list = split(s);
+		double result = calculate(list);
 		
+		System.out.print("Challenge 1 - ");
+		System.out.println(testChallenge1(s) ? "Correct!\n" : "Incorrect.\n");
+		
+		System.out.print("Challenge 2 - ");
+		System.out.println(testChallenge2(list) ? "Correct!\n" : "Incorrect.\n");
+		
+		System.out.print("Challenge 3 - ");
+		System.out.println(testChallenge3(result) ? "Correct!\n" : "Incorrect.\n");
 	}
 }