~~~~~~~~~
OPERATORS
~~~~~~~~~

Arithmetic Operators
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 Operator     Description     Sample       Meaning
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  +           Addition        x+y          addition of x and y
  -           Subtraction     x-y          difference between x and y
  *           Multiplication  x*y          multiplication of x and y
  /           Division        x/y          ratio of x and y
  **          Exponential     x**y         x to the power of y
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Comparison Operators
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Operator      Description           Sample           Meaning
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.GT.          Greater than          x.GT.y           Is x greater than y?
.LT.          Less than             x.LT.y           Is x less than y?
.EQ.          Equal                 x.EQ.y           Is x equal to y?
.LE.          Greater than or equal x.GE.y           Is x greater than or equal to y?
.GE.          Less than or equal    x.LE.y           Is x less than or equal to y?
.NE.          Not equal             x.NE.y           Is x not equal to  y?
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Logical Operators
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Operator       Meaning
-----------------------------
.NOT.          Negation
.AND.          Conjunction
.OR.           Disjunction
.EQV.          Equivalence
.NEQV.         Nonequivalence
------------------------------

Let p and q be logical variables, then truth tables

 p  q  .NOT.p   .NOT.q
 -  -  -------  ------
 F  F     T        T
 F  T     T        F
 T  F     F        T
 T  T     F        F

 -----------------------------------------
 p  q  p.AND.q  p.OR.q  p.EQV.q  p.NEQV.q
 -  -  -------  ------  -------  -------- 
 F  F     F        F       T        F
 F  T     F        T       F        T
 T  F     F        T       F        T
 T  T     T        T       T        F

Other operators
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Operator    Description                               Example
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!           initiates a comment, everything after     ! this is a comment, i love comments
            this character on the same line is
            ignored by the compiler.

//          String concatenation operator             "centi" // "meters" = "centimeters"
            which joins two individual strings
            or adds one strings to another

&           Continuation Operator                      PRINT *,'This is a
                                                      &         test string'
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