函数定义如下,若有函数调用语句y=tryfact(5);则y= 。 module tryfact; // 函数的定义************************************** function[31:0] factorial; input[3:0] operand; reg[3:0] index; begin factorial = operand? 1 : 0; for(index = 2;index <= operand;index= index+1) factorial = index * factorial; end endfunction