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📄 personal tax.cpp

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💻 CPP
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#include<iostream.h>
void first(long double& x,char ch)
{if(ch=='y'||ch=='Y') x-=1260;
    else x-=800;
    if(x<=0) cout<<"\nYou don't need to pay any tax!\n";
}
long double tax(long double sal)
{long double n=0.0;int i,j;
    long int a[]={0,500,2000,5000,20000,40000,60000,80000,100000};
    double b[]={0.05,0.1,0.15,0.2,0.25,0.3,0.35,0.4,0.45};
    for(j=0;;)
     {if(sal>a[j]) j++;
      if(j>=8) break;
      if(sal<=a[j+1]) break;
     }
    for(i=j;i>0;i--) n+=(a[i]-a[i-1])*b[i-1];
    n+=(sal-a[j])*b[j];
    return n;
}
void main()
{long double sal;char ch;
    do
     {do
       {cout<<"\nDo you work in Guangzhou?(y---yes/n---no)";
        cin>>ch;
       }while(ch!='y'&&ch!='Y'&&ch!='n'&&ch!='N');
      do
       {cout<<"\nIuput your salary please:";
        cin>>sal;
       }while(sal<0);
      first(sal,ch);
      if(sal>0)
        {sal=tax(sal);
         cout.setf(ios::fixed);cout.precision(2);
         cout<<"\nYour tax is:"<<sal;
        }
      do
       {cout<<"\nContinue?(y---yes/n---no)";
        cin>>ch;
       }while(ch!='y'&&ch!='Y'&&ch!='n'&&ch!='N');
     }while(ch!='n'&&ch!='N');
}

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