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Java - Math.E property example
0 points
The Math.E property returns e mathematical constant (2.718281828459045...).
e is called Euler's number or Napier's constant. However, it was discovered by Jacob Bernoulli. It is a mathematical constant used as the base of the natural logarithm.
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public class MathExample {2
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public static void main(String[] args) {4
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System.out.println( Math.E ); // 2.7182818284590456
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System.out.println( Math.exp(1) ); // 2.7182818284590458
System.out.println( Math.exp(2) ); // 7.389056098930659
System.out.println( Math.exp(3) ); // 20.08553692318766810
}11
}| Syntax |
xxxxxxxxxx1 package java.lang;2 3 public final class Math {4 5 public static final double E = 2.7182818284590452354;6 7 }
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| Result | e number (2.718281828459045...). |
| Description |
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To calculate e The following function with infinity series can be used to get a better precision infinite number of iterations with big precision numbers.
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public class CustomMath {2
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static double computeE(int iterations) {4
double e = 0;5
for (int i = 0; i < iterations; i++) {6
double divider = 1;7
for (int j = 0; j < i; j++) {8
divider *= (j + 1);9
}10
e += (1.0 / divider);11
}12
return e;13
}14
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public static void main(String[] args) {16
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System.out.println(CustomMath.computeE(1) ); // 1.018
System.out.println(CustomMath.computeE(2) ); // 2.019
System.out.println(CustomMath.computeE(5) ); // 2.70833333333333320
System.out.println(CustomMath.computeE(10)); // 2.718281525573192221
System.out.println(CustomMath.computeE(20)); // 2.718281828459045522
System.out.println(CustomMath.computeE(50)); // 2.718281828459045523
}24
}Output:
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1.02
2.03
2.7083333333333334
2.71828152557319225
2.71828182845904556
2.7182818284590455