class college {
    name: string;
    staff_count: number;
    stud_count: number;
    constructor(n1: string, staf: number, stud: number)
    {
        this.name = n1;
        this.staff_count = staf;
        this.stud_count = stud;
    }
    display() {
        console.log(this.name);
    }
}
class comp_sci extends college{

    constructor(n1: string, staf: number, stud: number) {
        super(n1, staf, stud);
    }
    display() {
        console.log("Details of Computer science department");
        console.log("Hod name:" + this.name);
        console.log("Total number of staff:" + this.staff_count);
        console.log("Total number of student:" + this.stud_count);
    }
}
class civil extends college{
    constructor(n1: string, staf: number, stud: number) {
        super(n1, staf, stud);
    }
    display() {
        console.log("Details of Civil Engineering department");
        console.log("Hod name:" + this.name);
        console.log("Total number of staff:" + this.staff_count);
        console.log("Total number of student:" + this.stud_count);
    }
}
class ece extends college{
    constructor(n1: string, staf: number, stud: number) {
        super(n1, staf, stud);
    }
    display() {
        console.log("Details of Electronics and communication department");
        console.log("Hod name:" + this.name);
        console.log("Total number of staff:" + this.staff_count);
        console.log("Total number of student:" + this.stud_count);
    }
}
class it extends college{
    constructor(n1: string, staf: number, stud: number) {
        super(n1, staf, stud);
    }
    display() {
        console.log("Details of Information Technology department");
        console.log("Hod name:" + this.name);
        console.log("Total number of staff:" + this.staff_count);
        console.log("Total number of student:" + this.stud_count);
    }
}
var c = new college("Anna University",0,0);
c.display();
var cs = new comp_sci("Kannan", 15, 400);
var IT = new it("Sridhar", 12, 380);
var civ = new civil("Manivannan", 17, 450);
var Ece = new ece("Prince", 12, 400);
console.log("List of Departments available in the college");
        console.log("1.Computer science\n" + "2.Civil Engineering\n" + "3.Electronics and communication\n" + "4.Information Technology\n");
        console.log("Enter the option from the list to see the details");
        var choice: number = parseInt(prompt());
        switch (choice) {
            case 1: cs.display();
                break;
            case 2: civ.display();
                break;
            case 3: Ece.display();
                break;
            case 4: IT.display();
                break;
            default: console.log("Invalid option");
                break;
        }