When do we use bool variable ?

Answer 1

When a true/false value is required to be stored/tracked

http://www.learncpp.com/cpp-tutorial/26-boolean-values/

Answer 2

Any time you have a yes or no question/answer.

Answer 3

I used one here to verify my number.
https://code.sololearn.com/cF7iOkU73BYy/?ref=app

Answer 4

Think of it as a fork in the road of your code. If true, do one thing, if false do something else. Boolean variables should be named appropriately too - by convention you should prefix your variable names with "Is". For example, if determining that the side of a coin is heads I might create the variable name "IsHeads" .

Answer 5

In any flow control statements (if/else, switch, loops...)

Answer 6

yes

Answer 7

for true or false