3/4 assignments completed.

session_1/solution/Question_1.dart

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+import 'dart:io';
+
+void main() {
+  int N = takeInput();
+  runSeries(N);
+}
+
+int takeInput() {
+  print("Enter number of terms of the series");
+  int? N = int.parse(stdin.readLineSync()!);
+  return N;
+}
+
+void runSeries(int n) {
+  int a = 0;
+  int b = 1;
+  int c = a + b;
+  if (n < 1) {
+    print("Invalid input");
+  } else {
+    for (int i = 1; i <= n; i++) {
+      print(a);
+      a = b;
+      b = c;
+      c = a + b;
+    }
+  }
+}

session_1/solution/Question_2.dart

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+import 'dart:io';
+import 'dart:math';
+
+void main() {
+  int N = takeInput();
+  bool res = check(N);
+  if (res == true) {
+    print("Semiprime number");
+  } else {
+    print("Not a semiprime number");
+  }
+}
+
+int takeInput() {
+  print("Enter number");
+  int? N = int.parse(stdin.readLineSync()!);
+  return N;
+}
+
+check(int N) {
+  int l = sqrt(N).toInt();
+  for (int i = 2; i <= l; i++) {
+    if (N % i == 0) {
+      bool res_1 = checkPrime(i);
+      if (res_1 == true) {
+        int j = N ~/ i;
+        if ((j * i == N) && (j != i)) {
+          bool res_2 = checkPrime(j);
+          if (res_2 == true) {
+            return true;
+          }
+        }
+      }
+    }
+  }
+  return false;
+}
+
+checkPrime(int n) {
+  if (n > 1) {
+    int count = 0;
+    for (int i = 2; i < n; i++) {
+      if (n % i == 0) {
+        count += 1;
+      }
+    }
+    if (count == 0) {
+      return true;
+    } else {
+      return false;
+    }
+  } else {
+    return false;
+  }
+}

session_1/solution/Question_3.dart

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+import 'dart:io';
+
+void main() {
+  takeInput();
+}
+
+check(arr) {
+  int sum = 0;
+  bool res;
+  for (int j = 0; j < arr.length; j++) {
+    int x = arr[j];
+    res = checkPrime(x);
+    if (res == true) {
+      sum += x;
+    }
+  }
+  print("Sum of prime numbers in the array: $sum");
+  res = checkPrime(sum);
+  if (res == true) {
+    print("Sum of prime numbers of the array is prime");
+  } else {
+    print("Sum of prime numbers of the array is not prime");
+  }
+}
+
+bool checkPrime(int x) {
+  int count = 0;
+  if (x > 1) {
+    for (int i = 2; i < x; i++) {
+      if (x % i == 0) {
+        count += 1;
+      }
+    }
+    if (count == 0) {
+      return true;
+    } else {
+      return false;
+    }
+  } else {
+    return false;
+  }
+}
+
+takeInput() {
+  print("Enter number of elements of array");
+  int? N = int.parse(stdin.readLineSync()!);
+  List<int> arr = [];
+  for (int i = 0; i < N; i++) {
+    print("Enter element ${i + 1}");
+    int? x = int.parse(stdin.readLineSync()!);
+    arr.add(x);
+  }
+  check(arr);
+}

session_1/solution/Question_4.dart

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+import 'dart:io';
+
+class BranchElective {
+  List<String> B_CN = []; //List containing branch elective course name
+  List<String> B_CD = []; //List containing branch elective course code
+  List<String> br = []; //List containing branch name
+  List<int> yr = []; //List containing year
+
+  String? courseName;
+  String? courseCode;
+  String? branch;
+  int? year;
+
+  void takeInput() {
+    print("Enter name of branch:");
+    branch = stdin.readLineSync();
+    br.add(branch!);
+    print("Enter year:");
+    year = int.parse(stdin.readLineSync()!);
+    yr.add(year!);
+    print("Enter course name:");
+    courseName = stdin.readLineSync();
+    B_CN.add(courseName!);
+    print("Enter course code:");
+    courseCode = stdin.readLineSync();
+    B_CD.add(courseCode!);
+  }
+
+  void display() {
+    bool found = false;
+    print("Enter name of branch:");
+    branch = stdin.readLineSync();
+    print("Enter year:");
+    year = int.parse(stdin.readLineSync()!);
+    for (int i = 0; i < br.length; i++) {
+      if ((br[i] == branch) && (year == yr[i])) {
+        found = true;
+        print("Course name: ${B_CN[i]}  Course code:${B_CD[i]}");
+      }
+    }
+    if (found == false) {
+      print("No courses have been added");
+    }
+  }
+}
+
+class OpenElective {
+  List<String> O_CN = []; //List containing open elective course name
+  List<String> O_CD = []; //List containing branch elective course code
+
+  String? courseName;
+  String? courseCode;
+
+  void takeInput() {
+    print("Enter course name:");
+    courseName = stdin.readLineSync();
+    O_CN.add(courseName!);
+    print("Enter course code:");
+    courseCode = stdin.readLineSync();
+    O_CD.add(courseCode!);
+  }
+
+  void display() {
+    if (O_CD.length == 0) {
+      print("No courses have been added");
+    } else {
+      print("Courses are:");
+      for (int i = 0; i < O_CD.length; i++) {
+        print("Course name: ${O_CN[i]}  Course code:${O_CD[i]}");
+      }
+    }
+  }
+}
+
+void main() {
+  var BE = new BranchElective();
+  var OE = new OpenElective();
+
+  int? i = 1;
+
+  while (i == 1) {
+    print("Enter type of user 1.Admin  2.Student");
+    int? ch_1 = int.parse(stdin.readLineSync()!);
+    print("Enter course type 1.Open elective  2.Branch elective");
+    int? ch_2 = int.parse(stdin.readLineSync()!);
+    if (ch_2 == 1) {
+      if (ch_1 == 1) {
+        OE.takeInput();
+      }
+      if (ch_1 == 2) {
+        OE.display();
+      }
+    }
+    if (ch_2 == 2) {
+      if (ch_1 == 1) {
+        BE.takeInput();
+      }
+      if (ch_1 == 2) {
+        BE.display();
+      }
+    }
+    print("Press 1 to continue and 0 to exit");
+    i = int.parse(stdin.readLineSync()!);
+  }
+}

session_3/solutions/number_trivia/.gitignore

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+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+**/ios/Flutter/.last_build_id
+.dart_tool/
+.flutter-plugins
+.flutter-plugins-dependencies
+.packages
+.pub-cache/
+.pub/
+/build/
+
+# Web related
+lib/generated_plugin_registrant.dart
+
+# Symbolication related
+app.*.symbols
+
+# Obfuscation related
+app.*.map.json
+
+# Android Studio will place build artifacts here
+/android/app/debug
+/android/app/profile
+/android/app/release

session_3/solutions/number_trivia/.metadata

@@ -0,0 +1,10 @@
+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: 77d935af4db863f6abd0b9c31c7e6df2a13de57b
+  channel: stable
+
+project_type: app

session_3/solutions/number_trivia/README.md

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+# Number Trivia
+
+Fun facts about your favorite number just a click away!
+
+## App in action
+
+<img src="./pics/app.gif" width="200">
+
+

session_3/solutions/number_trivia/analysis_options.yaml

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+# This file configures the analyzer, which statically analyzes Dart code to
+# check for errors, warnings, and lints.
+#
+# The issues identified by the analyzer are surfaced in the UI of Dart-enabled
+# IDEs (https://dart.dev/tools#ides-and-editors). The analyzer can also be
+# invoked from the command line by running `flutter analyze`.
+
+# The following line activates a set of recommended lints for Flutter apps,
+# packages, and plugins designed to encourage good coding practices.
+include: package:flutter_lints/flutter.yaml
+
+linter:
+  # The lint rules applied to this project can be customized in the
+  # section below to disable rules from the `package:flutter_lints/flutter.yaml`
+  # included above or to enable additional rules. A list of all available lints
+  # and their documentation is published at
+  # https://dart-lang.github.io/linter/lints/index.html.
+  #
+  # Instead of disabling a lint rule for the entire project in the
+  # section below, it can also be suppressed for a single line of code
+  # or a specific dart file by using the `// ignore: name_of_lint` and
+  # `// ignore_for_file: name_of_lint` syntax on the line or in the file
+  # producing the lint.
+  rules:
+    # avoid_print: false  # Uncomment to disable the `avoid_print` rule
+    # prefer_single_quotes: true  # Uncomment to enable the `prefer_single_quotes` rule
+
+# Additional information about this file can be found at
+# https://dart.dev/guides/language/analysis-options

session_3/solutions/number_trivia/android/.gitignore

@@ -0,0 +1,13 @@
+gradle-wrapper.jar
+/.gradle
+/captures/
+/gradlew
+/gradlew.bat
+/local.properties
+GeneratedPluginRegistrant.java
+
+# Remember to never publicly share your keystore.
+# See https://flutter.dev/docs/deployment/android#reference-the-keystore-from-the-app
+key.properties
+**/*.keystore
+**/*.jks