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How I can prevent rounding error in C++ or fix it?
Example:
float SomeNumber = 999.9999;
cout << SomeNumber << endl;
It prints out 1000!
883
you need to include <iomanip> and use the std::setprecision manipulator. To get the level of accuracy you want you will need to use double s rather than float s.
Rounding errors are due to inexactness in the representation of real numbers and the arithmetic operations done with them. This is a form of quantization error.
You can alter the rounding done by cout by setting the precision.
cout.precision(7);
float SomeNumber = 999.9999;
cout << SomeNumber << endl;
Alternatively, you can use printf from cstdio.
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