Delete calcEngine.java
Hamothy
4 years ago
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GitHub
parent
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commit
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@ -1,187 +0,0 @@
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import java.time.LocalDate;
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import java.time.format.DateTimeFormatter;
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import java.util.Scanner;
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public class calcEngine {
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static double execute(char opCode, double leftVal, double rightVal) {
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/* Return the correct value
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// Enhanced Switch Statement
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switch (opCodes[i]) {
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case 'a' -> results[i] = leftVals[i] + rightVals[i];
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case 's' -> results[i] = leftVals[i] - rightVals[i];
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case 'm' -> results[i] = leftVals[i] * rightVals[i];
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case 'd' -> results[i] = rightVals[i] != 0 ? leftVals[i] / rightVals[i] : 0.0d;
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default -> {
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System.out.println("Invalid opCode" + opCodes[i]);
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results[i] = 0.0d;
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}
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}
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*/
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double result;
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switch (opCode) {
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case 'a':
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result = leftVal + rightVal;
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break;
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case 's':
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result = leftVal - rightVal;
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break;
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case 'm':
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result = leftVal * rightVal;
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break;
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case 'd':
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result = rightVal != 0 ? leftVal / rightVal : 0.0d;
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break;
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default:
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System.out.println("Invalid opCode" + opCode);
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result = 0.0d;
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break;
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}
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return result;
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}
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static double getCommandLine(String[] args) {
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/* Handle the command line arguments and get the result */
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char opCode = args[0].charAt(0);
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double leftVal = Double.parseDouble(args[1]);
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double rightVal = Double.parseDouble(args[2]);
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return execute(opCode, leftVal, rightVal);
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}
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static char getOpCodeFromString(String operationName) {
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/* Return the opcode from the string*/
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return operationName.charAt(0);
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}
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static double valueFromWord(String word) {
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/* Return the double representation of the number */
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String[] values = {
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"zero", "one", "two", "three", "four", "five",
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"six", "seven", "eight", "nine", "ten"
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};
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double value = -1d;
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for (int i = 0; i < values.length; i++) {
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if (word.equals(values[i])) {
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value = i;
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break;
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}
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}
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// Checking to see if value had changed, if not. Parse the string into a double
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if (value == -1)
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value = Double.parseDouble(word);
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return value;
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}
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static char symbolFromOpCode(char opCode) {
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/* Get the relevant symbol for the operation given by the user*/
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char[] opCodes = {'a', 's', 'm', 'd'};
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char[] symbols = {'+', '-', '*', '/'};
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char symbol = ' ';
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// Loop through the list of chars and get the relevant symbol
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for (int i = 0; i < opCodes.length; i++) {
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if (opCode == opCodes[i]) {
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symbol = symbols[i];
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break;
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}
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}
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return symbol;
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}
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static void displayResult(char opCode, double leftVal, double rightVal, double result) {
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/* Display the result of the expression but nicely formatted */
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char symbol = symbolFromOpCode(opCode);
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// StringBuilder stringBuilder = new StringBuilder();
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// stringBuilder.append(leftVal);
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// stringBuilder.append(" " + symbol + " ");
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// stringBuilder.append(rightVal);
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// stringBuilder.append(" = ");
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// stringBuilder.append(result);
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// String finalResult = stringBuilder.toString();
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String finalResult = String.format("%.1f %c %.1f = %.1f",
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leftVal, symbol, rightVal, result);
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System.out.println(finalResult);
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}
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static void handleWhen(String[] stringParts) {
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/* Return date arithmetic operation (days added) */
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DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("dd-MM-yyyy");
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LocalDate startDate = LocalDate.parse(stringParts[1], dateTimeFormatter);
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long daysToAdd = (long) valueFromWord(stringParts[2]);
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LocalDate newDate = startDate.plusDays(daysToAdd);
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String output = String.format("%s + %d days is %s",
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startDate.format(dateTimeFormatter), daysToAdd, newDate.format(dateTimeFormatter));
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System.out.println(output);
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}
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static void performOperation(String[] stringParts) {
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/* Execute the operation with the numbers given by the user */
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char opCode = getOpCodeFromString(stringParts[0]);
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if (opCode == 'w') {
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handleWhen(stringParts);
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} else {
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double leftVal = valueFromWord(stringParts[1]);
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double rightVal = valueFromWord(stringParts[2]);
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double result = execute(opCode, leftVal, rightVal);
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displayResult(opCode, leftVal, rightVal, result);
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}
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}
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static void executeInteractively() {
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/* Allow the user to be able to enter in numbers for operations */
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Scanner in = new Scanner(System.in);
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System.out.println("Enter in an operation and two numbers");
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String userInput = in.nextLine();
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in.close();
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String[] stringParts = userInput.split(" ");
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performOperation(stringParts);
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}
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public static void main(String[] args) {
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double[] leftVals = {100.0d, 25.0d, 225.0d, 11.0d};
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double[] rightVals = {50.0d, 92.0d, 17.0d, 3.0};
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char[] opCodes = {'d', 'a', 's', 'm'};
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double[] results = new double[opCodes.length];
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// Make sure the user has entered in command line arguments before trying to use them
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if (args.length == 0) {
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// Get the results of the operation and store it into an array
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for (int i = 0; i < opCodes.length; i++)
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results[i] = execute(opCodes[i], leftVals[i], rightVals[i]);
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// Print out all the results stored in the array
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for (double currentResult: results)
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System.out.println(currentResult);
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} else if (args.length == 1 && args[0].equals("interactive")) {
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executeInteractively();
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} else if (args.length == 3)
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System.out.println(getCommandLine(args));
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else
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System.out.println("Please Enter 3 Command Line Arguments!");
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}
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}
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