With the following code:
#include <bits/stdc++.h>
using namespace std;
const double pi = 3.14159;
int main() {
double x;
cin >> x;
cout << "A=" << pi * x * x << endl;
return 0;
}
And inputting
100.64
I get the value 31819.3, while what I want is 31819.3103
I tried using set precision but that doesn't seem to work either. Why is this happening?
