129 lines
3.8 KiB
Java
129 lines
3.8 KiB
Java
package spring24.week4;
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import java.io.File;
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import java.io.FileNotFoundException;
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import java.util.ArrayList;
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import java.util.Scanner;
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public class Challenge {
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/**
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* CHALLENGE 1:
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* Read and store the contents of a file into a String or other type for further processing.
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*
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* @param f
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* @return
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*/
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public static String readFile(File f) {
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if(f == null) return null; // Catch if the File does not exist.
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// 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.
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try (Scanner s = new Scanner(f)){
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// TODO: Populate the variable from above with Strings from the file.
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} catch (FileNotFoundException e) {
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e.printStackTrace();
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}
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// TODO: Convert your variable to a String variable.
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return ""; // TODO: Return the variable.
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}
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/**
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* CHALLENGE 2:
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* Given an input String, store each token in an ArrayList.
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*
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* A token is a single word, symbol, or character, surrounded on both sides by a space.
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*
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* @param s
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* @return
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*/
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public static ArrayList<String> split(String s) {
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ArrayList<String> list = new ArrayList<String>();
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// TODO: Take the input String array s and add each separate word (separated by a space) to the ArrayList.
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return list;
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}
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/**
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* CHALLENGE 3:
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* Given an input ArrayList of tokens (assume all are valid integers, doubles, or operations ('+','-','*','/','%','(', and ')')),
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* calculate the result using correct order of operations. The output should only contain 4 decimal places, rounding up if the 5th place
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* is greater than 5.
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*
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* HINT: Think of a data structure that might be useful for this.
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*
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* @param tokens
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*/
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public static double calculate(ArrayList<String> tokens) {
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return 0.0; // TODO: Implement this method.
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}
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public static boolean testChallenge1(String s) {
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return s.equals("( ( 5 + 5 ) * 5 * 3 ) / ( 5 * 3 + ( 8 * 4 ) )");
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}
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public static boolean testChallenge2(ArrayList<String> list) {
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// Don't do this to answer Challenge 2. This is the only way to not give away a solution.
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ArrayList<String> expected = new ArrayList<>();
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expected.add("(");
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expected.add("(");
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expected.add("5");
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expected.add("+");
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expected.add("5");
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expected.add(")");
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expected.add("*");
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expected.add("5");
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expected.add("*");
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expected.add("3");
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expected.add("/");
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expected.add("(");
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expected.add("5");
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expected.add("*");
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expected.add("3");
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expected.add("+");
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expected.add("(");
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expected.add("8");
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expected.add("*");
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expected.add("4");
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expected.add(")");
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expected.add(")");
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if(expected.size() != list.size()) {
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System.out.println("Your solution for Challenge 2 does not correctly tokenize! You have too few or too many elements.");
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return false;
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}
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for(int i = 0; i < expected.size(); i++)
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if(!(expected.get(i).equals(list.get(i)))) {
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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.");
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return false;
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}
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return true;
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}
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public static boolean testChallenge3(double result) {
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return result == 3.1915;
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}
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// Test driver for the three coding challenges.
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public static void main(String[] args) {
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File f = new File("spring24/week4/Example.txt");
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String s = readFile(f);
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ArrayList<String> list = split(s);
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double result = calculate(list);
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System.out.print("Challenge 1 - ");
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System.out.println(testChallenge1(s) ? "Correct!\n" : "Incorrect.\n");
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System.out.print("Challenge 2 - ");
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System.out.println(testChallenge2(list) ? "Correct!\n" : "Incorrect.\n");
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System.out.print("Challenge 3 - ");
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System.out.println(testChallenge3(result) ? "Correct!\n" : "Incorrect.\n");
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}
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} |