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Merge pull request #4282 from chandra1123/NAN 

Nan in Java
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Loredana Crusoveanu 2018-05-19 23:12:16 +03:00 committed by GitHub
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core-java/src/main/java/com/baeldung/nan/NaNExample.java Normal file
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package com.baeldung.nan;
/**
* Sample usage of NaN.
*
*/
public class NaNExample {
public static void main(String[] args) {
NaNExample naNExample = new NaNExample();
naNExample.demo();
}
void demo() {
undefined_operations_produce_NaN();
operations_with_no_real_results_produce_NaN();
operations_with_NaN_produce_NaN();
comparison_with_NaN();
check_if_a_value_is_NaN();
assign_NaN_to_missing_values();
}
void undefined_operations_produce_NaN() {
System.out.println("Undefined Operations Produce NaN");
final double ZERO = 0;
System.out.println("ZERO / ZERO = " + (ZERO / ZERO));
System.out.println("INFINITY - INFINITY = " + (Double.POSITIVE_INFINITY - Double.POSITIVE_INFINITY));
System.out.println("INFINITY * ZERO = " + (Double.POSITIVE_INFINITY * ZERO));
System.out.println();
}
void operations_with_no_real_results_produce_NaN() {
System.out.println("Operations with no real results produce NaN");
System.out.println("SQUARE ROOT OF -1 = " + Math.sqrt(-1));
System.out.println("LOG OF -1 = " + Math.log(-1));
System.out.println();
}
void operations_with_NaN_produce_NaN() {
System.out.println("Operations with NaN produce NaN");
System.out.println("2 + NaN = " + (2 + Double.NaN));
System.out.println("2 - NaN = " + (2 - Double.NaN));
System.out.println("2 * NaN = " + (2 * Double.NaN));
System.out.println("2 / NaN = " + (2 / Double.NaN));
System.out.println();
}
void assign_NaN_to_missing_values() {
System.out.println("Assign NaN to Missing values");
double salaryRequired = Double.NaN;
System.out.println(salaryRequired);
System.out.println();
}
void comparison_with_NaN() {
System.out.println("Comparison with NaN");
final double NAN = Double.NaN;
System.out.println("NaN == 1 = " + (NAN == 1));
System.out.println("NaN > 1 = " + (NAN > 1));
System.out.println("NaN < 1 = " + (NAN < 1));
System.out.println("NaN != 1 = " + (NAN != 1));
System.out.println("NaN == NaN = " + (NAN == NAN));
System.out.println("NaN > NaN = " + (NAN > NAN));
System.out.println("NaN < NaN = " + (NAN < NAN));
System.out.println("NaN != NaN = " + (NAN != NAN));
System.out.println();
}
void check_if_a_value_is_NaN() {
System.out.println("Check if a value is NaN");
double x = 1;
System.out.println(x + " is NaN = " + (x != x));
System.out.println(x + " is NaN = " + (Double.isNaN(x)));
x = Double.NaN;
System.out.println(x + " is NaN = " + (x != x));
System.out.println(x + " is NaN = " + (Double.isNaN(x)));
System.out.println();
}
}