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showpoint: insert a decimal point unconditionally in a generated floating-point field.
fixed: insert floating-point values in fixed-point format. For example,
default format for 1234.56789 is 1234.57,
fixed makes it 1234.56789.
scientific: insert floating-point values in scientific format with an exponent field. For example,
default format for 1234.56789 is 1234.567,
scientific makes it 1.234568e+03.
Note: the above manipulators are sticky: they persist until another manipulator is applied.
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