A constant and and a constant means that
If both the constants are not zero then we will output TRUE but if any one is zero we will output FALSE.
a constant or or a constant means if any one of the constants is non zero then we will output true else false.
A constant isn't actually just a constant.. If I say Yes I am eating Maggi today for dinner, then it's easier for the computer to store the fact that the answer to whether I'm eating Maggi is non zero. Which means I will be eating Maggi.
Since there are so many languages, and even in English there are various ways to say Yes, e.gaffirmative, it is agreed upon, etc
The computer doesn't like using the word Yes, it just represents my willingness to eat Maggi by a non zero number. And if I do not wish to eat Maggi it'll assign the number to be 0