Guzman9797

class BankAccount {
  String accountNumber;
  String accountHolder;
  double _balance;

  // Constructor
  BankAccount(this.accountNumber, this.accountHolder, [double balance = 0.0])
      : _balance = balance;

  // Deposit money

Guzman9797

class Contact {
  String name;
  String phoneNumber;
  String email;

  Contact({required this.name, required this.phoneNumber, required this.email});

  @override
  String toString() {
    return 'Name: $name, Phone: $phoneNumber, Email: $email';

Guzman9797

void main() {

  List<String> students = [

    'Angela', 'john', 'micheal', 'David', 'Destiny',

    'Favour', 'Grace', 'james', 'mark', 'samuel'

  ];

Guzman9797

class MathUtils {
  // Calculate base raised to the given exponent (default is square)
  static num power(num base, [num exponent = 2]) {
    // Use math.pow from the dart:math library
    return base == 0 && exponent == 0 ? 1 : math.pow(base, exponent);
  }

  // Calculate factorial of a non-negative integer
  static int factorial(int n) {
    if (n < 0) {

Guzman9797

// Converts Celsius to Fahrenheit: °C × (9/5) + 32
double celsiusToFahrenheit(double celsius) {
  return celsius * (9 / 5) + 32;
}

// Converts Fahrenheit to Celsius: (F - 32) × 5/9
double fahrenheitToCelsius(double fahrenheit) {
  return (fahrenheit - 32) * 5 / 9;
}

Guzman9797

void main() {
  int n = 5;

  // Pattern 1
  for (int i = 1; i <= n; i++) {
    String row = "";
    for (int j = 1; j <= i; j++) {
      row += "*"; 
    }
    print(row);