Data commit

Task/Convert-decimal-number-to-rational/Java/convert-decimal-number-to-rational-1.java

@@ -0,0 +1,34 @@
+double fractionToDecimal(String string) {
+    int indexOf = string.indexOf(' ');
+    int integer = 0;
+    int numerator, denominator;
+    if (indexOf != -1) {
+        integer = Integer.parseInt(string.substring(0, indexOf));
+        string = string.substring(indexOf + 1);
+    }
+    indexOf = string.indexOf('/');
+    numerator = Integer.parseInt(string.substring(0, indexOf));
+    denominator = Integer.parseInt(string.substring(indexOf + 1));
+    return integer + ((double) numerator / denominator);
+}
+
+String decimalToFraction(double value) {
+    String string = String.valueOf(value);
+    string = string.substring(string.indexOf('.') + 1);
+    int numerator = Integer.parseInt(string);
+    int denominator = (int) Math.pow(10, string.length());
+    int gcf = gcf(numerator, denominator);
+    if (gcf != 0) {
+        numerator /= gcf;
+        denominator /= gcf;
+    }
+    int integer = (int) value;
+    if (integer != 0)
+        return "%d %d/%d".formatted(integer, numerator, denominator);
+    return "%d/%d".formatted(numerator, denominator);
+}
+
+int gcf(int valueA, int valueB) {
+    if (valueB == 0) return valueA;
+    else return gcf(valueB, valueA % valueB);
+}

Task/Convert-decimal-number-to-rational/Java/convert-decimal-number-to-rational-2.java

@@ -0,0 +1,12 @@
+import org.apache.commons.math3.fraction.BigFraction;
+
+public class Test {
+
+    public static void main(String[] args) {
+        double[] n = {0.750000000, 0.518518000, 0.905405400, 0.142857143,
+            3.141592654, 2.718281828, -0.423310825, 31.415926536};
+
+        for (double d : n)
+            System.out.printf("%-12s : %s%n", d, new BigFraction(d, 0.00000002D, 10000));
+    }
+}