OPERATORS
 
     The arithmetic operators include the following signs:
 
     + addition
     - subtraction
     * multiplication
     / division
     ^ raising to a power (exponentation); ^ = up arrow
 
     On a line containing more tha one operator, there is a set order in 
     which operations always occur. If several operators are used together, 
     the computer assigns priorities as follows: First, exponentiation, then 
     multiplication and division, and last, addition and subtraction. If two 
     operations have the same priority, then calculations are performed in 
     order from left to right. If you want these operations to occur in a 
     different order, BASIC allows you to give a calculation a higher 
     priority by placing parentheses around it. Operations enclosed in 
     parentheses will be calculated before any other operation. You have to 
     make sure that your equations have the same number of left parentheses 
     as right parentheses, or you will get a SYNTAX ERROR message when your 
     program is run.
     There are also operators for equalities and inequalities, called 
     relational operators. Arithmetic operators always take priority over 
     relational operators.
 
     =  equal to
     <  less than
     >  greater than
     <= less than or equal to
     =< less than or equal to
     >= greater than or equal to
     => greater than or equal to
     <> not equal to
     >< not equal to
 
     Finally there are thee logical operators, with lower priority than both 
     arithmetic and relational operators:
 
     AND
     OR
     NOT
 
     These are used most often to join multiple formulas in IF...THEN 
     statements. When they are used with arithmetic operators, they are 
     evaluated last (i.e., after + and -).
 
     Examples:
 
     IF A=B AND C=D THEN 100
         Requires both A=B & C=D to be true.
 
     IF A=B OR C=D THEN 100
         Allows either A=B or C=D to be true.
 
     A=5:B=4:PRINT A=B
         Displays a value of 0.
 
     A=5:B=4:PRINT A>B
         Displays a value of -1.
 
     PRINT 123 AND 15:PRINT 5 OR 7
         Displays 11 and 7.