APPENDIXB  Summary of Operators  Arithmetic  Relational  208  Operator  Operation  Type of Operands  Type of Result  (unary)  +  identity  Integer or Real  same as operand  (unary)  - sign inversion  Integer or Real  same as operand  +  addition  Integer or Real  Integer or Real  subtraction  Integer or Real  Integer or Real  *  multiplication  Integer or Real  Integer or Real  /  real division  Integer or Real  Real  div  integer division  Integer  Integer  mod  modulus  Integer  Integer  Operator  Operation  Tvpe of Operands  Type of Result  equality  simple, pointer,  Boolean  set, or string  <>  inequality  simple, pointer,  Boolean  set, or string  <=  less than  simple or string  Boolean  or equal  <=  set inclusion  set  Boolean  >=  greater than  simple or string  Boolean  or equal  >=  set inclusion  set  Boolean  <  less than  simple or string  Boolean  >  greater than  simple or string  Boolean  in  set membership  ordinal  and  set  Boolean 