Delete calcEngine.java

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