c++第三次上机实验

#include <iostream>   using namespace std;int main( ){double dsalary,dTax=0,dNetIncome=0,x,y,n; cout<<"请输入您本月的收入总额（元）：";cin>>dsalary;    if(dsalary<=3500)     dTax=0,dNetIncome=dsalary; else if(dsalary-3500<1500)x=0.03,y=0;else if((dsalary-3500)<4500)x=0.1,y=105;else if((dsalary-3500)<9000)    x=0.2,y=555;else if((dsalary-3500)<35000)    x=0.25,y=1005;    else if((dsalary-3500)<55000)   x=0.3,y=2755;    elseif((dsalary-3500)<80000)    x=0.35,y=5505;      else    x=0.45,y=13505;dTax=(dsalary-3500)*x-y;     dNetIncome=dsalary-dTax;cout<<"您本月应缴个人所和税 "<<dTax<<" 元，税后收入是 "<<dNetIncome<<" 元。\n";cout<<"依法纳税，共享繁荣。谢谢使用！\n"; return 0;cin>>n;}