Fixed length decimal, float is 4 bytes, 8 bytes double
% f decimal output type float
% lf decimal output of the first two types of double default save six decimal places, insufficient bits 0s, over six truncated
% e output exponentially decimal, the output e in lowercase
% E output decimal exponentially, the output of E uppercase
% le output decimal exponentially, the output e in lowercase
% lE output decimal exponentially, the resulting output E capital
% g is a more intelligent representation, using fewer charactersThe default type numbers:
integer default int, decimal default double.
Data type and format control characters
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Origin www.cnblogs.com/fennleo/p/12375560.html
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