diff --git a/Assignment1/Calculator/.gitignore b/Assignment1/Calculator/.gitignore
new file mode 100644
index 0000000..603b140
--- /dev/null
+++ b/Assignment1/Calculator/.gitignore
@@ -0,0 +1,14 @@
+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
diff --git a/Assignment1/Calculator/.idea/codeStyles/Project.xml b/Assignment1/Calculator/.idea/codeStyles/Project.xml
new file mode 100644
index 0000000..681f41a
--- /dev/null
+++ b/Assignment1/Calculator/.idea/codeStyles/Project.xml
@@ -0,0 +1,116 @@
+
+
+
+
+
+
+
+
+
+
+
+
+ xmlns:android
+
+ ^$
+
+
+
+
+
+
+
+
+ xmlns:.*
+
+ ^$
+
+
+ BY_NAME
+
+
+
+
+
+
+ .*:id
+
+ http://schemas.android.com/apk/res/android
+
+
+
+
+
+
+
+
+ .*:name
+
+ http://schemas.android.com/apk/res/android
+
+
+
+
+
+
+
+
+ name
+
+ ^$
+
+
+
+
+
+
+
+
+ style
+
+ ^$
+
+
+
+
+
+
+
+
+ .*
+
+ ^$
+
+
+ BY_NAME
+
+
+
+
+
+
+ .*
+
+ http://schemas.android.com/apk/res/android
+
+
+ ANDROID_ATTRIBUTE_ORDER
+
+
+
+
+
+
+ .*
+
+ .*
+
+
+ BY_NAME
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/Assignment1/Calculator/.idea/gradle.xml b/Assignment1/Calculator/.idea/gradle.xml
new file mode 100644
index 0000000..d291b3d
--- /dev/null
+++ b/Assignment1/Calculator/.idea/gradle.xml
@@ -0,0 +1,16 @@
+
+
+
+
+
+
\ No newline at end of file
diff --git a/Assignment1/Calculator/.idea/misc.xml b/Assignment1/Calculator/.idea/misc.xml
new file mode 100644
index 0000000..37a7509
--- /dev/null
+++ b/Assignment1/Calculator/.idea/misc.xml
@@ -0,0 +1,9 @@
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/Assignment1/Calculator/.idea/runConfigurations.xml b/Assignment1/Calculator/.idea/runConfigurations.xml
new file mode 100644
index 0000000..7f68460
--- /dev/null
+++ b/Assignment1/Calculator/.idea/runConfigurations.xml
@@ -0,0 +1,12 @@
+
+
+
+
+
+
\ No newline at end of file
diff --git a/Assignment1/Calculator/app/.gitignore b/Assignment1/Calculator/app/.gitignore
new file mode 100644
index 0000000..796b96d
--- /dev/null
+++ b/Assignment1/Calculator/app/.gitignore
@@ -0,0 +1 @@
+/build
diff --git a/Assignment1/Calculator/app/build.gradle b/Assignment1/Calculator/app/build.gradle
new file mode 100644
index 0000000..c4fcc2d
--- /dev/null
+++ b/Assignment1/Calculator/app/build.gradle
@@ -0,0 +1,29 @@
+apply plugin: 'com.android.application'
+
+android {
+ compileSdkVersion 29
+ buildToolsVersion "29.0.3"
+ defaultConfig {
+ applicationId "com.example.calculator"
+ minSdkVersion 15
+ targetSdkVersion 29
+ versionCode 1
+ versionName "1.0"
+ testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+ }
+ buildTypes {
+ release {
+ minifyEnabled false
+ proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+ }
+ }
+}
+
+dependencies {
+ implementation fileTree(dir: 'libs', include: ['*.jar'])
+ implementation 'androidx.appcompat:appcompat:1.0.2'
+ implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
+ testImplementation 'junit:junit:4.12'
+ androidTestImplementation 'androidx.test.ext:junit:1.1.0'
+ androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
+}
diff --git a/Assignment1/Calculator/app/proguard-rules.pro b/Assignment1/Calculator/app/proguard-rules.pro
new file mode 100644
index 0000000..f1b4245
--- /dev/null
+++ b/Assignment1/Calculator/app/proguard-rules.pro
@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+# http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+# public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile
diff --git a/Assignment1/Calculator/app/src/androidTest/java/com/example/calculator/ExampleInstrumentedTest.java b/Assignment1/Calculator/app/src/androidTest/java/com/example/calculator/ExampleInstrumentedTest.java
new file mode 100644
index 0000000..f1004c0
--- /dev/null
+++ b/Assignment1/Calculator/app/src/androidTest/java/com/example/calculator/ExampleInstrumentedTest.java
@@ -0,0 +1,27 @@
+package com.example.calculator;
+
+import android.content.Context;
+
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see Testing documentation
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+ @Test
+ public void useAppContext() {
+ // Context of the app under test.
+ Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
+
+ assertEquals("com.example.calculator", appContext.getPackageName());
+ }
+}
diff --git a/Assignment1/Calculator/app/src/main/AndroidManifest.xml b/Assignment1/Calculator/app/src/main/AndroidManifest.xml
new file mode 100644
index 0000000..1efe66d
--- /dev/null
+++ b/Assignment1/Calculator/app/src/main/AndroidManifest.xml
@@ -0,0 +1,21 @@
+
+
+
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/Assignment1/Calculator/app/src/main/java/com/example/calculator/MainActivity.java b/Assignment1/Calculator/app/src/main/java/com/example/calculator/MainActivity.java
new file mode 100644
index 0000000..aa585b9
--- /dev/null
+++ b/Assignment1/Calculator/app/src/main/java/com/example/calculator/MainActivity.java
@@ -0,0 +1,286 @@
+package com.example.calculator;
+
+import androidx.appcompat.app.AppCompatActivity;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.TextView;
+import java.util.Stack;
+
+public class MainActivity extends AppCompatActivity {
+ @Override
+ protected void onCreate(Bundle savedInstanceState) {
+ super.onCreate(savedInstanceState);
+ setContentView(R.layout.activity_main);
+ manageClicks();
+ }
+ private void manageClicks(){
+ findViewById(R.id.tv_00).setOnClickListener(appListener);
+ findViewById(R.id.tv_0).setOnClickListener(appListener);
+ findViewById(R.id.tv_1).setOnClickListener(appListener);
+ findViewById(R.id.tv_2).setOnClickListener(appListener);
+ findViewById(R.id.tv_3).setOnClickListener(appListener);
+ findViewById(R.id.tv_4).setOnClickListener(appListener);
+ findViewById(R.id.tv_5).setOnClickListener(appListener);
+ findViewById(R.id.tv_6).setOnClickListener(appListener);
+ findViewById(R.id.tv_7).setOnClickListener(appListener);
+ findViewById(R.id.tv_8).setOnClickListener(appListener);
+ findViewById(R.id.tv_9).setOnClickListener(appListener);
+ findViewById(R.id.tv_add).setOnClickListener(appListener);
+ findViewById(R.id.tv_sub).setOnClickListener(appListener);
+ findViewById(R.id.tv_div).setOnClickListener(appListener);
+ findViewById(R.id.tv_mul).setOnClickListener(appListener);
+ findViewById(R.id.tv_mod).setOnClickListener(appListener);
+ findViewById(R.id.tv_ac).setOnClickListener(appListener);
+ findViewById(R.id.tv_del).setOnClickListener(appListener);
+ findViewById(R.id.tv_dot).setOnClickListener(appListener);
+ findViewById(R.id.tv_equal).setOnClickListener(appListener);
+ }
+ private View.OnClickListener appListener = new View.OnClickListener() {
+ @Override
+ public void onClick(View v) {
+ TextView screen = findViewById(R.id.tv_equation);
+ TextView answer = findViewById(R.id.tv_result);
+ if(v.getId() == R.id.tv_00){
+ if(screen.getText().toString() != "0"){
+ screen.setText(screen.getText().toString() + "00");
+ }
+ }
+ else if(v.getId() == R.id.tv_0){
+ if(screen.getText().toString() != "0"){
+ screen.setText(screen.getText().toString() + "0");
+ }
+ }
+ else if(v.getId() == R.id.tv_1){
+ screen.setText(screen.getText().toString() + "1");
+ }
+ else if(v.getId() == R.id.tv_2){
+ screen.setText(screen.getText().toString() + "2");
+ }
+ else if(v.getId() == R.id.tv_3){
+ screen.setText(screen.getText().toString() + "3");
+ }
+ else if(v.getId() == R.id.tv_4){
+ screen.setText(screen.getText().toString() + "4");
+ }
+ else if(v.getId() == R.id.tv_5){
+ screen.setText(screen.getText().toString() + "5");
+ }
+ else if(v.getId() == R.id.tv_6){
+ screen.setText(screen.getText().toString() + "6");
+ }
+ else if(v.getId() == R.id.tv_7){
+ screen.setText(screen.getText().toString() + "7");
+ }
+ else if(v.getId() == R.id.tv_8){
+ screen.setText(screen.getText().toString() + "8");
+ }
+ else if(v.getId() == R.id.tv_9){
+ screen.setText(screen.getText().toString() + "9");
+ }
+ else if(v.getId() == R.id.tv_add){
+ String curStr = screen.getText().toString();
+ if(curStr.length() != 0) {
+ char last = curStr.charAt(curStr.length() - 1);
+ if(last != '+' && last != '.'){
+ if(last == '/' || last == '*' || last == '-' || last == '%'){
+ int len = curStr.length();
+ String newStr = curStr.substring(0,len-1);
+ screen.setText(newStr+"+");
+ }
+ else{
+ screen.setText(screen.getText().toString() + "+");
+ }
+ }
+ }
+ }
+ else if(v.getId() == R.id.tv_sub){
+ String curStr = screen.getText().toString();
+ if(curStr.length() != 0) {
+ char last = curStr.charAt(curStr.length() - 1);
+ if(last != '-' && last != '.'){
+ if(last == '/' || last == '*' || last == '+' || last == '%'){
+ int len = curStr.length();
+ String newStr = curStr.substring(0,len-1);
+ screen.setText(newStr+"-");
+ }
+ else{
+ screen.setText(screen.getText().toString() + "-");
+ }
+ }
+ }
+ }
+ else if(v.getId() == R.id.tv_div){
+ String curStr = screen.getText().toString();
+ if(curStr.length() != 0) {
+ char last = curStr.charAt(curStr.length() - 1);
+ if(last != '/' && last != '.'){
+ if(last == '+' || last == '*' || last == '-' || last == '%'){
+ int len = curStr.length();
+ String newStr = curStr.substring(0,len-1);
+ screen.setText(newStr+"/");
+ }
+ else{
+ screen.setText(screen.getText().toString() + "/");
+ }
+ }
+ }
+ }
+ else if(v.getId() == R.id.tv_mul){
+ String curStr = screen.getText().toString();
+ if(curStr.length() != 0) {
+ char last = curStr.charAt(curStr.length() - 1);
+ if(last != '*' && last != '.'){
+ if(last == '/' || last == '+' || last == '-' || last == '%'){
+ int len = curStr.length();
+ String newStr = curStr.substring(0,len-1);
+ screen.setText(newStr+"*");
+ }
+ else{
+ screen.setText(screen.getText().toString() + "*");
+ }
+ }
+ }
+ }
+ else if(v.getId() == R.id.tv_mod){
+ String curStr = screen.getText().toString();
+ if(curStr.length() != 0) {
+ char last = curStr.charAt(curStr.length() - 1);
+ if(last != '%' && last != '.'){
+ if(last == '/' || last == '*' || last == '-' || last == '+'){
+ int len = curStr.length();
+ String newStr = curStr.substring(0,len-1);
+ screen.setText(newStr+"%");
+ }
+ else{
+ screen.setText(screen.getText().toString() + "%");
+ }
+ }
+ }
+ }
+ else if(v.getId() == R.id.tv_ac){
+ screen.setText("");
+ answer.setText("");
+ }
+ else if(v.getId() == R.id.tv_del){
+ if(screen.getText().toString().length() != 0){
+ String prevScreen = screen.getText().toString();
+ int len = prevScreen.length();
+ String newStr = prevScreen.substring(0,len-1);
+ screen.setText(newStr);
+ }
+ }
+ else if(v.getId() == R.id.tv_dot){
+ String curStr = screen.getText().toString();
+ boolean isPresent = false;
+ for(int i = 0; (i < curStr.length()); i++){
+ if(curStr.charAt(i) == '.'){
+ isPresent = true;
+ }
+ if(curStr.charAt(i) == '%' || curStr.charAt(i) == '/' ||
+ curStr.charAt(i) == '*' || curStr.charAt(i) == '+' ||
+ curStr.charAt(i) == '-'){
+ isPresent = false;
+ }
+ }
+ if(!isPresent){
+ if(curStr.length() != 0) {
+ char last = curStr.charAt(curStr.length() - 1);
+ if(last != '/' && last != '*' && last != '-' && last != '+' && last != '%'){
+ if(last != '.'){
+ screen.setText(screen.getText().toString() + ".");
+ }
+ }
+ else{
+ screen.setText(screen.getText().toString() + "0.");
+ }
+ }
+ else{
+ screen.setText("0.");
+ }
+ }
+ }
+ else if(v.getId() == R.id.tv_equal){
+ float ans = evaluate(screen.getText().toString());
+ answer.setText(ans+"");
+ }
+ }
+ };
+ private float evaluate(String expression)
+ {
+ char[] tokens = expression.toCharArray();
+ // Stack for numbers: 'values'
+ Stack values = new Stack();
+ // Stack for Operators: 'ops'
+ Stack ops = new Stack();
+ for (int i = 0; i < tokens.length; i++)
+ {
+ // Current token is a number, push it to stack for numbers
+ if (tokens[i] >= '0' && tokens[i] <= '9')
+ {
+ StringBuffer sbuf = new StringBuffer();
+ sbuf.append(tokens[i]);
+ // There may be more than one digits in number
+ while (i+1 < tokens.length && (tokens[i+1] >= '0' && tokens[i+1] <= '9')||
+ tokens[i] == '.') {
+ sbuf.append(tokens[i++]);
+ }
+ values.push(Float.parseFloat(sbuf.toString()));
+ }
+ // Current token is an operator.
+ else if (tokens[i] == '+' || tokens[i] == '-' ||
+ tokens[i] == '*' || tokens[i] == '/' || tokens[i] == '%')
+ {
+ // While top of 'ops' has same or greater precedence to current
+ // token, which is an operator. Apply operator on top of 'ops'
+ // to top two elements in values stack
+ while (!ops.empty() && hasPrecedence(tokens[i], ops.peek())){
+ values.push(applyOp(ops.pop(), values.pop(), values.pop()));
+ }
+ // Push current token to 'ops'.
+ ops.push(tokens[i]);
+ }
+ }
+ // Entire expression has been parsed at this point, apply remaining
+ // ops to remaining values
+ while (!ops.empty()){
+ values.push(applyOp(ops.pop(), values.pop(), values.pop()));
+ }
+ // Top of 'values' contains result, return it
+ return values.pop();
+ }
+
+ // Returns true if 'op2' has higher or same precedence as 'op1',
+ // otherwise returns false.
+ private boolean hasPrecedence(char op1, char op2)
+ {
+ if (op2 == '%')
+ return false;
+ if ((op1 == '*' || op1 == '/') && (op2 == '+' || op2 == '-'))
+ return false;
+ else
+ return true;
+ }
+
+ // A utility method to apply an operator 'op' on operands 'a'
+ // and 'b'. Return the result.
+ private float applyOp(char op, float b, float a)
+ {
+ switch (op)
+ {
+ case '+':
+ return a + b;
+ case '-':
+ return a - b;
+ case '*':
+ return a * b;
+ case '%':
+ return a % b;
+ case '/':
+ if (b == 0)
+ throw new
+ UnsupportedOperationException("Cannot divide by zero");
+ return a / b;
+ }
+ return 0;
+ }
+}
diff --git a/Assignment1/Calculator/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/Assignment1/Calculator/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
new file mode 100644
index 0000000..1f6bb29
--- /dev/null
+++ b/Assignment1/Calculator/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -0,0 +1,34 @@
+
+
+
+
+