I am strange with mql4.
Now I subtract two value Bid - MydoubleVar . But Result is not look like from calculator result.
Bid value is 1.01424MydoubleVar is 1.01427
If I used like that
MessageBox(Bid - MydoubleVar);
Message Box replied that -2.99999999999
Normal Calculator result is -0.00003
Why are they different.