Topic       : C-Language Documentation
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View Ref-File[ Conditional Operator  '?' ]

  Lvalue = <test> ? Rtrue: Rfalse;

where <test> is a logical expression.  This is equivalent to

  if( <test> ) Lvalue = Rtrue;
  else Lvalue = Rfalse;

The advantage of the conditional operator can be seen when Lvalue is
a complicated expression (involving arrays of pointers to structures
containing unions with pointers ...).  The savings is in program size
rather than speed.