interface Person {
  name: string;
  age: number;
  email: string;
}

function greet(person: Person): string {
  return `Hello, ${person.name}! You are ${person.age} years old.`;
}

const user: Person = {
  name: "Alice",
  age: 30,
  email: "alice@example.com",
};

console.log(greet(user));
console.log(`Email: ${user.email}`);

function calculateSum(a: number, b: number): number {
  return a + b;
}

console.log(`Sum of 5 and 10 is: ${calculateSum(5, 10)}`);