added all files

.gitignore

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+# Project exclude paths
+/out/

MathResolver.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

src/META-INF/MANIFEST.MF

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+Manifest-Version: 1.0
+Main-Class: dev.halq.Main
+

src/dev/halq/Calculator/Calculator.java

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+package dev.halq.Calculator;
+
+import dev.halq.Calculator.Utils.CalcUtil;
+
+import java.util.Scanner;
+
+import static dev.halq.Utils.CmdUtil.print;
+
+/**
+ * @author Halq
+ * @since 15/09/2022
+ */
+
+public class Calculator {
+
+    public static void calculatorMain() {
+        double firstvalue, secondvalue;
+
+        String op = null;
+        Scanner reader = new Scanner(System.in);
+
+        print("Please put first number");
+
+        if (!reader.hasNextDouble()) {
+            print("Please put valid value");
+            reader.hasNextDouble();
+
+        }
+
+        firstvalue = reader.nextDouble();
+
+        print("Please put math operator");
+
+        op = reader.next();
+
+        if (!(op.equals("+") || op.equals("-") || op.equals("+") || op.equals("/") || op.equals("%"))) {
+            print("Please put valid operator");
+
+        }
+
+        print("Please put second number");
+
+        if (!reader.hasNextDouble()) {
+            print("Please put valid value");
+            reader.hasNextDouble();
+
+        }
+
+        secondvalue = reader.nextDouble();
+
+        print("Result: ");
+        CalcUtil.calcq(op, firstvalue, secondvalue);
+
+    }
+}

src/dev/halq/Calculator/Utils/CalcUtil.java

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+package dev.halq.Calculator.Utils;
+
+import static dev.halq.Utils.CmdUtil.*;
+
+/**
+ * @author Halq
+ * @since 15/09/2022
+ */
+
+public class CalcUtil {
+
+    public static void calcq(String operator, double value, double value2){
+        switch (operator){
+
+         case "*":
+             calc(value * value2);
+             break;
+
+         case "+":
+             calc(value + value2);
+             break;
+
+         case "-":
+             calc(value - value2);
+             break;
+
+         case "/":
+             if(value == 0 || value2 == 0) {
+                 print("Impossible to divide number by 0");
+
+             } else {
+                 calc(value / value2);
+
+             }
+             break;
+
+         case "%":
+             calc(value % value2);
+             break;
+        }
+    }
+}

src/dev/halq/Equation/EquationResolver.java

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+package dev.halq.Equation;
+
+import java.util.Scanner;
+
+import static dev.halq.Utils.CmdUtil.print;
+
+/**
+ * @author Halq
+ * @since 15/09/2022
+ */
+
+public class EquationResolver {
+
+    public static void main() {
+        Scanner reader = new Scanner(System.in);
+
+        double a, b, c;
+
+        print("Please give me constants");
+
+        print("Ex: 2x - 3x - 5 = 0 , a: 2 b: -3 c: -5");
+
+        print("a:");
+        if (!reader.hasNextDouble()) {
+            print("Please give valid value");
+            reader.hasNextDouble();
+
+        }
+
+        a = reader.nextDouble();
+
+        print("b:");
+        if (!reader.hasNextDouble()) {
+            print("Please give valid value");
+            reader.hasNextDouble();
+
+        }
+
+        b = reader.nextDouble();
+
+        print("c:");
+        if (!reader.hasNextDouble()) {
+            print("Please give valid value");
+            reader.hasNextDouble();
+
+        }
+
+        c = reader.nextDouble();
+
+        if (a != 0) {
+            double r = (c - b) / a;
+
+            print("Answer = " + r);
+
+        } else if (b == c) {
+            print("Answer = all x");
+
+        } else {
+            print("Invalid equation");
+
+        }
+    }
+
+}

src/dev/halq/Main.java

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+package dev.halq;
+
+import dev.halq.Calculator.Calculator;
+import dev.halq.Equation.EquationResolver;
+
+import java.util.Scanner;
+import java.util.concurrent.TimeUnit;
+
+import static dev.halq.Utils.CmdUtil.print;
+
+/**
+ * @author Halq
+ * @since 15/09/2022
+ */
+
+public class Main {
+
+
+    public static void main(String[] args) throws InterruptedException {
+
+
+        Scanner reader = new Scanner(System.in);
+
+        String r = null;
+
+        print("Welcome for my MathResolver!!" + " Made by Halq!");
+        TimeUnit.SECONDS.sleep(1);
+
+        print("Wait.. loading MathResolver resources");
+        TimeUnit.SECONDS.sleep(3);
+
+        print("Calculator or Equation?");
+
+        r = reader.next();
+
+        if (r.equals("Calculator")) {
+            print("Loading calculator...");
+            TimeUnit.SECONDS.sleep(2);
+            Calculator.calculatorMain();
+
+        } else if (r.equals("Equation")) {
+            print("Loading Equation Resolver...");
+            TimeUnit.SECONDS.sleep(2);
+            EquationResolver.main();
+
+        } else {
+            print("Please put valid value (Calculator or Equation)");
+        }
+
+    }
+}