2.1.5. Logical operators: &&, ||, !

Conditions can be chained with "and", "or", and so on, which are expressed as follows

Operator, Meaning

&& = And

|| = Or

! = Not

So we can write things like

if ((option==1) && (user==2)) ...

if ((option==1) || (option==3)) ...

if ((!(option==correctOption)) || (pressedKey==ESC)) ...

Suggested exercises:

• Create a program that asks the user a numbers and answers if it is a mutiple of 2 or a multiple of 3.
• Create a program that asks the user for two integers and answers "One number is positive," "Both numbers are positive" or "None of the numbers is positive," as appropriate.
• Create a program that asks the user for three numbers and displays the greatest one.
• Create a program that asks the user to enter two numbers and says if they are equal or, otherwise, which one is the greatest.