You will see something strange in this code
which is : a > b && a == b && !(a > b && a == b) (a, b are double)
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
double qpow(double a, ll b)
{
double res = 1;
assert(b >= 0);
for (; b; b >>= 1)
{
if (b & 1)
res = res * a;
a = a * a;
}
return res;
}
double n, m;
double p;
double check(int x)
{
double p1 = 1 - p;
p1 = 1 - qpow(p1, x);
p1 = 1 / p1 * (n * x + m);
return p1;
}
void solve()
{
n = 10, m = 27, p = 2855;
// scanf("%lf%lf%lf", &n, &m, &p);
p /= 10000;
int l = 1, r = 10;
while (l < r)
{
int k = (r - l) / 3;
int mid1 = l + k;
int mid2 = l + k * 2;
double a = check(mid1), b = check(mid2);
if(mid1 == mid2) {
cout << (a > b) << endl;
cout << (a == b) << endl;
cout << (a > b && a == b) << endl;
cout << (a < b) << endl;
cout << *((ull*)(&a)) << endl;
cout << *((ull*)(&b)) << endl;
cout << a << endl;
cout << b << endl;
}
if (a > b)
{
if(mid1 == mid2) cout << (a == b) << endl;
l = mid1 + 1;
}
else
{
r = mid2;
}
}
}
int main()
{
solve();
}
Put this code in custom test with C++17
Could someone explain this?
