java - Why does float print only up to 8 Digits? -


when printing below statement 

system.out.println(121.3456422f);

i getting output 121.34564 (in 8 digits)

and if printing 

system.out.println(121345642.333332f);

i getting output 1.2134564e8 (in 10 digits including e)

i want know why float 8 digits only?

the default conversion of float string produces shortest decimal fraction convert float on input. 8 decimal digits, because float has 24 bits of effective significand.

the exact value of 121.3456422f 121.34564208984375. largest float smaller 121.34563446044921875. 121.34564 between values , closer original value alternative, 8 enough digits.


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