SEI CERT Oracle Coding Standard for Java

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changes.mady.by.user David Svoboda

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changes.mady.by.user Robert Seacord

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Comment: Changed denormalized to normalized in the compliant solution because the values in this example are in normalized form.

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Because this operation is imprecise, this code produces the following output when run in FP-strict mode:

Code Block
Original      : 0.33333334
Denormalized  : 2.8E-45
Restored      : 0.4

Compliant Solution

Do not use code that could use denormalized numbers. When calculations using float produce denormalized numbers, use of double can provide sufficient precision.

Code Block
bgColor#ccccff
double x = 1/3.0;
System.out.println("Original    : " + x);
x = x * 7e-45;
System.out.println("DenormalizedNormalized: " + x);
x = x / 7e-45;
System.out.println("Restored    : " + x);

This code produces the following output in FP-strict mode:

Code Block
Original      : 0.3333333333333333
Denormalized  Normalized: 2.333333333333333E-45
Restored      : 0.3333333333333333

Exceptions

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