|
|
Next: Logical Expressions
Up: Conditions
Previous: Relational Expressions
i < 10
total <= 1000.0
count != n
discriminant < 0.0
x * x + y * y < r*r
Obviously, depending on the values of the variables involved, each of
the above relational expressions is true or false.
For example if
x has the value 3, y is 6, and r is 10,
the last expression above evaluates to true, whereas if
x was 7 and y was 8 then it would evaluate to
false.
The value of a logical expression can be stored in a bool
variable for later use.
Any numerical expression can be used for the value of a condition,
with 0 being interpreted as false and any non zero value as
true.
This means that the value returned by a relational expression could be used in arithmetic. This is often done by programmers but it is a practice not to be recommended. It leads to a program that is difficult to understand.