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<                        Less than operator

 exp1  <  exp2           Test for exp1 less than exp2
 exp1, exp2              any expression of type int, float, char, enum, or
                         related types

    < is a relational operator, yielding a value of 1 (TRUE) if exp1 is
    less than exp2; or 0 (FALSE) if exp1 is not less than exp2.

    For values of types int and float, ordering is well defined. For type
    char, it is based on the underlying ASCII code. For enum types, it is
    based on the underlying int value.  Type conversion is performed as
    necessary before comparing the expressions, using the usual
    arithmetic conversions.  Here are two examples:

           if (number < guess)
               ...
           do  {
               ...
           } while (tries < 10);