Answer:
For listening sake
To listen to information from the computer
They receive audio input from the computer's sound card and produce audio output in the form of sound waves.
Answer:
- public class Main {
-
- public static void main (String [] args) {
-
- for(int i = 1; i < 10; i++){
- int num = 0;
- num += i;
- }
- System.out.println(num);
- }
- }
Explanation:
In programming each variable has its scope. For example, a variable defined within the for loop has no longer exist outside the loop body. To illustrate this we can write a short program as presented above.
Firstly, create a for loop that traverse the number 1 - 10 (Line 5 - 8). Within the loop create a variable num and initialize it with zero (Line 6) and increment it with i value for each iteration (Line 7).
Outside the loop, we try to print the num (Line 9). When we run the program this will result in an error as the num which is declared inside the for loop will no longer exist outside the loop body.
Answer:
Hi Riahroo! This is a good question on the concept of relational databases.
We can normalize the relations as follows:
Flight
(flightnumber (unique), flighttime, airline_id, departure_city, arrival_city, passenger_id, pilot_id, airplane_id)
has_one_and_belongs_to :airline
has_many :passengers
has_one :pilot
Itinerary(passenger_id, flight_id)
Belongs_to
Passenger_details
(passengername (unique), gender, date_of_birth)
has_many :flights
Pilot
(pilotname (unique), gender, date_of_birth)
has_many :flights
airline(airlinename)
airplane(planeID, type, seats))
Explanation:
To normalize a relation, we have to remove any redundancies from the relationships between database objects/tables and simplify the structure. This also means simplifying many-to-many relationships. In this question, we see there is a many-to-many relationship between flights and passengers. To resolve this we can introduce a join table which simplifies this relationship to a one-to-many between the objects.
Until one becomes mutated
Answer:
Explanation:
A constant is a name that references a value that cannot be changed while the program runs
Example in Javascript:
const x = 5;
cannot be reassign x
wronged: x = 10; (will throw an error try to assign value to constant variable)
