Help with Output Formatting
Why and how does this line output the following
Input:
float myFloat = 45.1342f;
System.out.printf("%3.4e", myFloat);
4.5134+01
Very confused
4 Replies
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Well that's what the
3.4e format specifier means.
3.4e means "ensure at least 3 letters (add spaces at the beginning if necessary)", "use 4 digits after the decimal point", "use scientific notation" (e)
In this case, the 3 is pretty unnecessary as you should always have more digits
and scientific notation means you always have one digit before the decimal point (except for +-0, NaN and +-Infinity)Formatter (Java SE 21 & JDK 21)
declaration: module: java.base, package: java.util, class: Formatter
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