### Re: 12342 Tax Calculator

Posted:

**Tue Dec 17, 2013 2:37 am**You are using floating point with ceil and multiplying by 10.0

see: http://floating-point-gui.de/

see: http://floating-point-gui.de/

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https://uva.onlinejudge.org/board/viewtopic.php?f=58&t=70957

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Posted: **Tue Dec 17, 2013 2:37 am**

You are using floating point with ceil and multiplying by 10.0

see: http://floating-point-gui.de/

see: http://floating-point-gui.de/

Posted: **Tue Mar 11, 2014 10:53 am**

Why am I got wrong answer?

Code: Select all

```
got ACCEPTED. I used the wrong tax calculation algorithm before XD
```

Posted: **Tue Mar 11, 2014 8:05 pm**

brianfry713 wrote:Don't use floating point at all in this problem.

Posted: **Thu Apr 03, 2014 2:42 pm**

Getting WA. Can not figure out the problem

Code: Select all

```
#include <iostream>
#include <string>
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
using namespace std;
int main()
{
long long amount,tax;
int tc,i;
cin>>tc;
for(i=1; i<=tc; i++)
{
// tax = 0;
cin>>amount;
if(amount<=180000)
tax = 0;
else
{
amount -= 180000;
if(amount<=300000)
{
tax = ceil(amount*10/100);
}
else if(amount>300000 && amount <=700000)
{
// tax = 30000;
amount -= 300000;
tax = 30000 + ceil(amount*15/100);
}
else if(amount>700000 && amount <= 1000000)
{
// tax = 90000;
amount -= 700000;
tax = 90000 + ceil(amount*20/100);
}
else if(amount>1000000)
{
// tax = 150000;
amount -= 1000000;
tax = 150000 + ceil(amount*25/100);
}
if(tax < 2000)
tax = 2000;
}
cout<<"Case "<<i<<": "<<tax<<endl;
}
}
```

Posted: **Thu Apr 03, 2014 11:53 pm**

brianfry713 wrote:brianfry713 wrote:Don't use floating point at all in this problem.

Posted: **Mon Sep 15, 2014 1:33 pm**

Thanks for this really key piece of advice. I wrote the program one way but changed my approach when I came here looking for test cases and saw what you'd written.brianfry713 wrote:Don't use floating point at all in this problem.

By the way, I've shared my test cases on uDebug.

Posted: **Sat Sep 20, 2014 1:36 pm**

I got WA. tested all the inputs in udebug..

I've searched for AC codes in google and there are so many ac codes with double type and ceil function like my code. Then what's wrong with my code..?

Here's 2 links of AC code's:

(Links are deleted after getting ac)

Here's my code... plz help...
Some other critical output can be of great help for debugging...

I'll delete the code and links aftre getting AC. thanks..

I've searched for AC codes in google and there are so many ac codes with double type and ceil function like my code. Then what's wrong with my code..?

Here's 2 links of AC code's:

(Links are deleted after getting ac)

Here's my code... plz help...

Code: Select all

`Got AC...`

I'll delete the code and links aftre getting AC. thanks..

Posted: **Sun Sep 21, 2014 2:59 pm**

According to problem description we must print integer greater than tax in case of floating point. So must check this case.If the calculated tax is a floating point then it must be replaced by the smallest integergreater than the payable tax.

Change your code

Code: Select all

```
break;
}
cout<<"Case "<<++count<<": ";
if(ans<2000 && ans!=0) ans=2000;
in = ans;
if (ans - in > 1e-6) in++;
cout<<in<<endl;
```

Posted: **Mon Sep 22, 2014 4:27 pm**

Thanks a lot.. I got ac...

Posted: **Wed Sep 24, 2014 1:46 pm**

Instead of checking if tax is a floating point, **ceil** can be used.

Posted: **Thu Sep 25, 2014 6:22 pm**

can't understand y "46 no line ===> if(tax-result > 1e-6 ) result++; " is not working , here's my code

Code: Select all

```
#include <iostream>
#include <math.h>
using namespace std;
int main()
{
long long n,t,cnt;
double tax;
int result;
cin>>t;
cnt=1;
while(t--)
{
cin>>n;
if(n<=180000)
cout<<"Case "<<cnt<<": 0"<<endl;
else
{
if(n<=480000)
{
n=n-180000;
tax=((10*n)/100);
}
else if(n<=880000)
{
n=n-480000;
tax=30000+((15*n)/100);
}
else if(n<=1180000)
{
n=n-880000;
tax=30000+60000+((20*n)/100);
}
else if(n>1180000)
{
n=n-1180000;
tax=30000+60000+60000+((25*n)/100);
}
result=tax;
if(tax-result > 1e-6) result++;
if(result<2000)
cout<<"Case "<<cnt<<": 2000"<<endl;
else
cout<<"Case "<<cnt<<": "<<result<<endl;
}
cnt++;
}
return 0;
}
```

Posted: **Fri Sep 26, 2014 1:33 am**

Don't use floating point at all in this problem.

Posted: **Fri Sep 26, 2014 9:49 am**

To brainfry,

can't understand, what should i use instead of floating point ?? how can obey this condition "If the calculated tax is a floating point then it must be replaced by the smallest integer greater than the payable tax." without using floating point

can't understand, what should i use instead of floating point ?? how can obey this condition "If the calculated tax is a floating point then it must be replaced by the smallest integer greater than the payable tax." without using floating point

Posted: **Fri Sep 26, 2014 2:03 pm**

Actually Brainfry is right. It is always better to avoit floating point calculation because it is very easy to get precision error or other mistakes.

For this problem to avoid floating point you could multiple by some constant number to work only with integers. You could use long long for**tax** and all values of **tax** keep multiplied by 100.
However I solved this problem with floating point. You must be very very careful in this case. In your code you have integer division mistake. You must convert to double to avoid integer divison. It can be done in different ways.

Change your code to
Don't forget to remove your code after getting accepted.

For this problem to avoid floating point you could multiple by some constant number to work only with integers. You could use long long for

Code: Select all

```
tax= 10 * n;
..
tax = 30000 + 15 * n;
..
tax = 30000 + 60000 + 20 * n;
..
tax = 30000 + 60000 + 60000 + 25 * n;
..
if (tax % 100 == 0)
{
// answer is integer = tax / 100
// print tax / 100
} else {
// answer is floating point number = tax / 100
// print (tax + 99) / 100; // ceil (tax)
}
```

Change your code to

Code: Select all

```
tax=((10*n)/100.0);
..
tax=30000+((15.0*n)/100);
..
tax=30000+60000+(double(20*n)/100.0);
..
tax=30000+60000+60000+((double(25)*n)/100.0);
```

It works ok! But you can also change it to ceilRedCode119 wrote:can't understand y "46 no line ===> if(tax-result > 1e-6 ) result++; " is not working

Code: Select all

`result = ceil(tax);`

Posted: **Sat Oct 25, 2014 11:24 pm**

Hi guys,

I am getting WA consistently. I have checked Inputs frm uDebug. I found that my code doesn't allow me to work with the numbers like 10000000000 and few more like this.

How can I deal with such long floats...? Is there any way ?
My code will be deleted if the code gets Accepted.

I am getting WA consistently. I have checked Inputs frm uDebug. I found that my code doesn't allow me to work with the numbers like 10000000000 and few more like this.

How can I deal with such long floats...? Is there any way ?

Code: Select all

```
#include <cstdio>
#include <iostream>
#include <cmath>
using namespace std;
int main ()
{
// The Code got accepted...Thanks
// Original Code has been DELETED.
return 0;
}
```