C++ infinite loop

Question

I am attempting to write a loop that will repeat until the user enters one of the correct choices (either 1 or 0). For some reason when I have the loop written as below it

Answer 1

The only way to break out

while ((control != 0 )|| (control != 1))

is

!(control != 0) && !(control != 1)

which is equivalent to

control == 0 && control == 1

which is impossible for all integers.

Answer 2

(control != 0) || (control != 1)

is equivalent to,

!(control == 0 && control == 1)

but,

(control == 0 && control == 1) 

is always false (there is no such number).

Therefore, the whole expression will always get true value.

Answer 3

You have to use && operator.

while ((control != 0 ) && (control != 1))