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5.6.cout float
5.6.1.Displaying floating-point values in system default, scientific and fixed formats
5.6.2.ios::right|ios::scientific|ios::showpoint
5.6.3.Displaying numbers in scientific notation
5.6.4.Normal (default) mode; only show 5 digits, including both sides of decimal point
5.6.5.Controlling precision of floating-point values