Is there a functional difference between “2.00” and “2.00f”?

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The f suffix makes it a single precision(float) literal instead of a double precision literal. This usually means 32 bit instead of 64 bit floats.

Floating-point constants default to type double. By using the suffixes f or l (or F or L — the suffix is not case sensitive), the constant can be specified as float or long double, respectively.

http://msdn.microsoft.com/en-us/library/tfh6f0w2(v=VS.100).aspx

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