Java math: exp(): get e to the power of a number

Java math exp() method returns Euler's number e raised to the power of a double value.

 

Signature

public static double exp(double a)

 

Special cases to consider

a. If the argument is NaN, the result is NaN.

b. If the argument is positive infinity, then the result is positive infinity.

c. If the argument is negative infinity, then the result is positive zero.

 

Find the below working application.

 

ExpMethodDemo.java

package com.sample.app;

public class ExpMethodDemo {
	
	public static void main(String[] args) {
		System.out.printf("exp(%f) is %f\n", 10.0, Math.exp(10.0));
		
		// If the argument is NaN, the result is NaN.
		System.out.printf("exp(%f) is %f\n", Double.NaN, Math.exp(Double.NaN));
		
		// If the argument is positive infinity, then the result is positive infinity.
		System.out.printf("exp(%f) is %f\n", Double.POSITIVE_INFINITY, Math.exp(Double.POSITIVE_INFINITY));
		
		// If the argument is negative infinity, then the result is positive zero.
		System.out.printf("exp(%f) is %f\n", Double.NEGATIVE_INFINITY, Math.exp(Double.NEGATIVE_INFINITY));
		
	}

}

 

Output

exp(10.000000) is 22026.465795
exp(NaN) is NaN
exp(Infinity) is Infinity
exp(-Infinity) is 0.000000

 

  

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