The Boolean Expression is an expression that 
evaluates to be either true or false.

If the Boolean Expression is true the code
associated with it will be executed.  If the
Boolean Expression is false, the code
associated with it will be skipped.

Example:


if (x == 7)
{
   printf ("x equals 7\n");
   printf ("seven is a lucky number.\n");
}


In the example above, the Boolean Expression is:

(x == 7)