Guys I have a question:
39268112/50000000*4 is exactly 3.14144896
But when i write a code in c++ as such:
#include<iostream.h>
using namespace std;
int main()
{
int a = 39268112;
int b = 50000000;
cout << (double)a / (double)b * 4;
}
But, I get 3.14145.
This is not the exact value.
So my question is:
how can i always display the exact value of a
doubledivision?
EDIT: I am aware of the setprecision option, the problem here is just, that I have to know the exact value of the result to know how many decimals the result will have. Since I wrote a program, which approximates PI based on dart throws, the two integers a and b can have much bigger values than 39268112 and 5000000.
If I would use
cout << setprecision(some number) << (double)a / (double)b * 4;
I need to know the exact result first, before I can even enter the argument in setprecision()
My edited question would be if there is a way to automaticly put an argument in setprecision() so that it can display the exact result, without having to calculate it myself first.
