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I compile and run this code with MSVC2008
long double x = 111111111;
long double y = 222222222;
long double Z = x * y;
cout << z << endl;
When I debug, z equals
24691357975308640
Mathematically z should be
24691357975308642
What’s going on ?
Doubles are only precise to around 16 digits. If I counted right, then you have 17 digits, and are correct up to 16. If you want to do this kind of math, and will only have integers, then use ints. For a number that large, you will need to use
uint64_t.