Data commit

Task/Calculating-the-value-of-e/Java/calculating-the-value-of-e-1.java

@@ -0,0 +1,10 @@
+double e(long limit) {
+    double e = 1;
+    for (long term = 1; term <= limit; term++)
+        e += 1d / factorial(term);
+    return e;
+}
+
+long factorial(long value) {
+    return value == 1 ? value : value * factorial(--value);
+}

Task/Calculating-the-value-of-e/Java/calculating-the-value-of-e-2.java

@@ -0,0 +1,3 @@
+import static java.math.RoundingMode.HALF_UP;
+import java.math.BigDecimal;
+import java.math.BigInteger;

Task/Calculating-the-value-of-e/Java/calculating-the-value-of-e-3.java

@@ -0,0 +1,19 @@
+BigDecimal e(BigInteger limit, int scale) {
+    BigDecimal e = BigDecimal.ONE.setScale(scale, HALF_UP);
+    BigDecimal n;
+    BigInteger term = BigInteger.ONE;
+    while (term.compareTo(limit) <= 0) {
+        n = new BigDecimal(String.valueOf(factorial(term)));
+        e = e.add(BigDecimal.ONE.divide(n, scale, HALF_UP));
+        term = term.add(BigInteger.ONE);
+    }
+    return e;
+}
+
+BigInteger factorial(BigInteger value) {
+    if (value.compareTo(BigInteger.ONE) > 0) {
+        return value.multiply(factorial(value.subtract(BigInteger.ONE)));
+    } else {
+        return BigInteger.ONE;
+    }
+}

Task/Calculating-the-value-of-e/Java/calculating-the-value-of-e-4.java

@@ -0,0 +1 @@
+BigDecimal e = e(BigInteger.valueOf(100), 1000);

Task/Calculating-the-value-of-e/Java/calculating-the-value-of-e-5.java

@@ -0,0 +1,16 @@
+public class CalculateE {
+    public static final double EPSILON = 1.0e-15;
+
+    public static void main(String[] args) {
+        long fact = 1;
+        double e = 2.0;
+        int n = 2;
+        double e0;
+        do {
+            e0 = e;
+            fact *= n++;
+            e += 1.0 / fact;
+        } while (Math.abs(e - e0) >= EPSILON);
+        System.out.printf("e = %.15f\n", e);
+    }
+}