Why I have WA#10? I can't think test to get wrong answer. PLS help me

Next my code:

#include <iostream>
#include <iomanip>
#include <cmath>

using namespace std;

int main()
{
    double a, b, c, x, y, x2, y2;
    double X, Y, Z, X2, Y2, Z2;
    double result = 0;
    bool bflag = true;
    cin >> a >> b >> c;
    for (int i=0; i < 2; i++)
    {
        cin >> x >> y;
        if (x < c)
        {
            X = 0;
            Y = y - b - c;
            Z = x;
        }
        else if (x > c + a)
        {
            X = a;
            Y = y - b - c;
            Z = 2 * c + a - x;
        }
        else
        {
            if (y <= b)
            {
                X = x - c;
                Y = b - y;
                Z = 0;
            }
            else if (y <= b + c)
            {
                X = x - c;
                Y = 0;
                Z = y - b;
            }
            else if (y <= b)
            {
                X = x - c;
                Y = y - b - c;
                Z = c;
            }
            else
            {
                X = x - c;
                Y = b;
                Z = 2 * b + 2 * c - y;
            }
        }
        if (bflag)
        {
            x2 = x;
            y2 = y;
            X2 = X;
            Y2 = Y;
            Z2 = Z;
            bflag = false;
        }
    }
    //cout << X << ' ' << Y << ' ' << Z << ' ' << X2 << ' ' << Y2 << ' ' << Z2; это типа отладка
    X2 -= X;
    Y2 -= Y;
    Z2 -= Z;
    result = sqrt(X2 * X2 + Y2 * Y2 + Z2 * Z2);
    if (result < 1.E-8)
        cout << fixed << setprecision(6) << 0;
    else
        cout << fixed << setprecision(6) << result;

    return 0;
}

Sorry, I'm find mistake now, it's a one wrong if in my code, thk all to find this