SOQL-13.cls

/*
Insert an Account along with 1 related Contact.
*/
public class ques1 {
    public static void fun(){
        Account a = new Account(name='account_new');
        insert a;
        //Id is a field that is autogenerated once record is inserted into the database.
        if (a.Id != null){
        	Contact c = new Contact(Lastname='Contact_new',AccountId=a.Id,phone='123456');
            insert c;  
        }
   }
}