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A frequently encountered mistake is the doomed comparison with NaN, typically in expressions. As per its semantics, no value (including NaN itself) can be compared to NaN using common operators. This noncompliant example demonstrates one of such the many violations.
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public class NaNComparison {
public static void main(String[] args) {
double x = 0.0;
double result = Math.cos(1/x); // returns NaN if input is infinity
if(result == Double.NaN) // compare with infinity
System.out.println("Both are equal");
}
}
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