????：function computer($num1,$num2,$opt){switch($opt){case "+":$reslut = $num1+$num2;break;case "-":$reslut = $num1-$num2;break;case "*":$reslut = $num1*$num2;break;case "

function computer($num1,$num2,$opt){

switch($opt){

case "+":

$reslut = $num1+$num2;

break;

case "-":

$reslut = $num1-$num2;

break;

case "*":

$reslut = $num1*$num2;

break;

case "/":

$reslut =  $num2==0? '錯(cuò)誤'：$num1/$num2;

break;

default:

$reslut="錯(cuò)誤";

}

return $reslut;

}

echo computer(10,5,*);

?? ???：天蓬老師?? ??：2019-03-16 13:07:18
???? ??：這個(gè)案例,你學(xué)到了什么呢? 不想談?wù)剢?