Logical Operators and Boolean Expressions

You are already familiar with these. Recall that in the preceding exercise, you did the following comparison:

var now = DateTime.Now.Date == DateTime.UtcNow.Date;

This output assigns the value true to now if the dates are equal. But as you know, they might not necessarily be the same. Therefore, if the dates are different, a false value will be assigned. These two values are the result of such Boolean expressions and are called Boolean values. That is why the now variable has the type of bool.

Boolean expressions are the base for every logical comparison in every program. Based on these comparisons, a computer can execute a certain behavior in a program. Here are some other examples of Boolean expressions and variable assignments:

• Assigning the result of a comparison that checks whether a is greater than b:

  var basicComparison = a > b;

• Assigning the result of a comparison that checks whether b is greater than or...