buzzcode2007/XS-IBDP_Compsci-Java_Intro
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updated code

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H. Saw 2024-01-16 10:53:45 +00:00
parent 3697c483d3
commit a9c5691dac
1 changed files with 68 additions and 40 deletions
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108
src/xs_ibdpcompsci_javaintro/calculator.java
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@ -1,5 +1,6 @@
package xs_ibdpcompsci_javaintro;
import java.util.*;
import java.util.regex.Pattern;
class RPN_Calculator {
static void handle_error(int ERROR_TYPE) {
@ -8,7 +9,7 @@ class RPN_Calculator {
switch (ERROR_TYPE) {
case -1:
// Delete the previous line to allow users to edit it.
System.out.println("\033[A");
System.out.print("\r");
break;
case -2:
ERROR_MESSAGE = "Memory exceeded.";
@ -22,47 +23,60 @@ class RPN_Calculator {
break;
};
System.out.println(ERROR_MESSAGE);
}
};
static ArrayList<Object> request_input() {
Scanner input = new Scanner(System.in);
// Initialize variables.
ArrayList<Object> USER_INPUTS = new ArrayList<Object>();
String USER_INPUT_CURRENT = "";
Boolean USER_INPUT_MORE = true;
int USER_INPUT_LENGTH = 0;
Pattern COMMANDENTRY_NUMBER = Pattern.compile("-?\\d+(\\.\\d+)?", Pattern.CASE_INSENSITIVE);
Pattern COMMANDENTRY_OPERATION = Pattern.compile("[-+\\/*×÷]", Pattern.CASE_INSENSITIVE);
Pattern COMMANDENTRY_EXIT = Pattern.compile("\\b([Ee]xit|[Qq]|[Tt]erminate|[Qq]uit)\\b", Pattern.CASE_INSENSITIVE);
// Loop for input.
do {
Scanner input = new Scanner(System.in);
USER_INPUT_CURRENT = input.nextLine();
// Determine the length of the existing list.
USER_INPUT_LENGTH = USER_INPUTS.size();
// Ask for any input.
System.out.print("> ");
USER_INPUT_CURRENT = input.nextLine().trim();
if (USER_INPUT_CURRENT.matches("-?\\d+(\\.\\d+)?")) {
// Acceptable Entries:
// - number
// - operations after two numbers
// - blank (exit)
if (COMMANDENTRY_NUMBER.matcher(USER_INPUT_CURRENT).find()) {
// number input
USER_INPUTS.add(Double.parseDouble(USER_INPUT_CURRENT));
} else if (USER_INPUTS.size() >= 2) {
if (USER_INPUT_CURRENT.matches("[-+\\/*×÷]") && (String.valueOf(USER_INPUTS.get(USER_INPUT_LENGTH-1)).matches("-?\\d+(\\.\\d+)?"))) {
USER_INPUTS.add(USER_INPUT_CURRENT);
} else if (USER_INPUT_CURRENT.isBlank()) {
if (String.valueOf(USER_INPUTS.get(USER_INPUT_LENGTH-1)).isBlank()) {
System.exit(0);
} else if (String.valueOf(USER_INPUTS.get(USER_INPUT_LENGTH-1)).matches("-?\\d+(\\.\\d+)?")) {
handle_error(-1);
} else if (USER_INPUT_LENGTH >= 2) {
if (COMMANDENTRY_OPERATION.matcher(USER_INPUT_CURRENT).find()) {
if (USER_INPUTS.get(USER_INPUT_LENGTH - 1).getClass() == Double.class) {
// mathematical symbol input
USER_INPUTS.add(USER_INPUT_CURRENT);
} else {
USER_INPUT_MORE = false;
// Correct the mathematical operator.
System.out.print("\r\r"+ "> "+ USER_INPUT_CURRENT);
USER_INPUTS.set(USER_INPUT_LENGTH - 1, USER_INPUT_LENGTH);
};
} else if (USER_INPUT_CURRENT.isBlank() && USER_INPUTS.get(USER_INPUT_LENGTH - 1).getClass() == String.class) {
USER_INPUT_MORE = false;
} else {
handle_error(-1);
};
}
} else if (COMMANDENTRY_EXIT.matcher(USER_INPUT_CURRENT).find()) {
System.exit(0);
} else {
// The user inputs a wrong code. Let the user edit it.
handle_error(-1);
};
} while (USER_INPUT_MORE == true);
return (USER_INPUTS);
}
@ -81,29 +95,42 @@ class RPN_Calculator {
for (int ENTRY_CURRENT = 0; ENTRY_CURRENT < ENTRIES_LIST_LENGTH; ENTRY_CURRENT++) {
if (String.valueOf(ENTRIES_LIST.get(ENTRY_CURRENT)).matches("[-+\\/*×÷]")) {
OPERATION = String.valueOf(ENTRIES_LIST.get(ENTRY_CURRENT));
OPERATION_RESULT = (OPERATION_ITERATIONS>0) ? OPERATION_RESULT : NUMBERS_CURRENT.get(0);
for (int ENTRY_CURRENT_NUMBERS = 1; ENTRY_CURRENT_NUMBERS < NUMBERS_CURRENT.size(); ENTRY_CURRENT_NUMBERS++) {
if (OPERATION == "*" || OPERATION == "×") {
OPERATION_RESULT *= NUMBERS_CURRENT.get(ENTRY_CURRENT_NUMBERS);
} else if (OPERATION == "/" || OPERATION == "÷") {
if (NUMBERS_CURRENT.get(ENTRY_CURRENT_NUMBERS) != 0) {
OPERATION_RESULT /= (float) ENTRIES_LIST.get(ENTRY_CURRENT - 1);
} else {
handle_error(-3);
break;
if (OPERATION_ITERATIONS <= 0) {OPERATION_RESULT = NUMBERS_CURRENT.get(0); NUMBERS_CURRENT.remove(0);};
switch (OPERATION) {
case "*":
case "×":
for (Double NUMBER_CURRENT : NUMBERS_CURRENT) {
OPERATION_RESULT *= NUMBER_CURRENT;
};
} else if (OPERATION == "+") {
OPERATION_RESULT += NUMBERS_CURRENT.get(ENTRY_CURRENT_NUMBERS);
} else if (OPERATION == "-") {
OPERATION_RESULT -= NUMBERS_CURRENT.get(ENTRY_CURRENT_NUMBERS);
};
OPERATION_ITERATIONS++;
break;
case "/":
case "÷":
for (Double NUMBER_CURRENT : NUMBERS_CURRENT) {
if (NUMBER_CURRENT != 0) {
OPERATION_RESULT /= NUMBER_CURRENT;
} else {
handle_error(-3);
break;
};
};
break;
case "+":
for (Double NUMBER_CURRENT : NUMBERS_CURRENT) {
OPERATION_RESULT += NUMBER_CURRENT;
};
break;
case "-":
for (Double NUMBER_CURRENT : NUMBERS_CURRENT) {
OPERATION_RESULT -= NUMBER_CURRENT;
};
break;
default:
break;
};
NUMBERS_CURRENT.clear();
OPERATION_ITERATIONS++;
NUMBERS_CURRENT.clear();
} else {
NUMBERS_CURRENT.add((double) ENTRIES_LIST.get(ENTRY_CURRENT));
};
@ -119,7 +146,8 @@ class RPN_Calculator {
ArrayList<Object> NUMBERS_INPUT = new ArrayList<Object>();
double NUMBER_RESULT;
while (true) {
NUMBERS_INPUT = request_input();
NUMBERS_INPUT = request_input();
System.out.println("Solving: "+NUMBERS_INPUT);
NUMBER_RESULT = calculate(NUMBERS_INPUT);
System.out.println(NUMBER_RESULT);
}