小弟跪求下面程序的注释!谢谢!
#include<inostream.h>
#include<stdlib.h>
doubleSD(int a,int b,char op){
doublex;
switch(op){
case'+':x=double(a)+b;break;
case"-":x=double-b;break;
case'*':x=double(a)*b;break;
case'/':if(b)x=double(a)/b;
else exit(1):
break;
default:exit(1);
}
return x;
}