• The conditional operator has the following C-like format:
• cond_expr ? true_expr : false_expr
• The true_expr or the false_expr is evaluated and used as a result depending on what cond_expr evaluates to (true or false).

  1 program conditional {
  2   bit out;
  3   reg enable,data ;
  4   
  5   enable = 0;
  6   data  = 1; 
  7   out = (enable) ? data : 1'bz;
  8   printf(" Enable %b  Data %b    Out %b\n",enable,data,out);
  9 
 10   enable = 1;
 11   out = (enable) ? data : 1'bz;
 12   printf(" Enable %b  Data %b    Out %b\n",enable,data,out);
 13 }

  Enable 0  Data 1    Out z
  Enable 1  Data 1    Out 1

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