added fraction decimal to binary

conversions/fraction_decimal_to_binary.dart

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+// Author: ShivangSrivastava
+// Email: [email protected]
+
+/// Converts a decimal number to binary with optional precision for fractional part
+/// https://www.geeksforgeeks.org/convert-decimal-fraction-binary-number/
+String decimalToBinary(double value, [int precision = 10]) {
+  bool isNegative = value.isNegative;
+  if (isNegative) {
+    value = -value;
+  }
+
+  int intPart = value.toInt();
+  String binaryOfIntPart = intToBinary(intPart);
+
+  double fracPart = value - intPart;
+  String binaryOfFracPart = fracToBinary(fracPart, precision);
+
+  return isNegative
+      ? "-$binaryOfIntPart.$binaryOfFracPart"
+      : "$binaryOfIntPart.$binaryOfFracPart";
+}
+
+/// Converts an integer to binary string
+String intToBinary(int value) {
+  String binary = "";
+
+  while (value > 0) {
+    binary = (value % 2).toString() + binary;
+    value = value ~/ 2;
+  }
+
+  return binary;
+}
+
+/// Converts a fractional part to binary string up to given precision
+String fracToBinary(double value, [int precision = 10]) {
+  StringBuffer binary = StringBuffer();
+  double fraction = value;
+
+  for (int i = 0; i < precision; i++) {
+    fraction *= 2;
+    if (fraction >= 1) {
+      binary.write('1');
+      fraction -= 1;
+    } else {
+      binary.write('0');
+    }
+
+    if (fraction == 0) {
+      break;
+    }
+  }
+
+  return binary.toString();
+}
+
+void main() {
+  String result = decimalToBinary(10.25);
+  print(result);
+}