how to print all the number of the array

Answer 1

You could use a for loop:
int arr[5] = {1, 2, 3, 4, 5};
for (int x=0;x<5;x++) {
cout << arr[x] << endl;
}

Answer 2

int b[] = {10, 20, 30, 40, 50, 60}
for(a=0; a<6; a++){
cout << b[a];
}