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AdvDiv.dart

@@ -0,0 +1,110 @@
+String times10(String nstring) {
+	if(nstring.contains(".") && nstring.indexOf(".")==nstring.length - 2)
+		return nstring.replaceFirst(".", "");
+	if(nstring.contains("."))
+		return nstring.split(".")[0]+nstring.split(".")[1][0]+"."+nstring.split(".")[1].substring(1);
+	return nstring+"0";
+}
+String? advdiv(double n1d, double n2d, int ri, [final String rstr1 = "[", final String rstr2 = "]"]) {
+	bool over = false;
+	int carry = 0, newcarry = 0, x, d;
+	int? rcount = null;
+	String n1string, n2string, r, res = "";
+	List<int> carries;
+	List<String> n1s;
+	late final int n1, n2, dotx;
+	late final String sign;
+	late final List<String> n1s1;
+
+	if(n2d==0)
+		return null;
+	sign = (n1d < 0 ? n2d >= 0 : n2d < 0) ? "-" : "";
+	n1d = n1d.abs();
+	n2d = n2d.abs();
+	ri = ri.abs();
+	r = ri.toString();
+	n1string = n1d.toString();
+	n2string = n2d.toString();
+
+	while(n1string.contains(".") || n2string.contains(".")) {
+		if(!n1string.contains(".")) {
+			n1string+= r[0];
+			if(r.length > 1)
+				r = r.substring(1)+r[0];
+		}
+		else {
+			n1string = times10(n1string);
+			if(n1string.contains(".")) {
+				n1string+= r[0];
+				if(r.length > 1)
+					r = r.substring(1)+r[0];
+			};
+		};
+		n2string = times10(n2string);
+	};
+
+	n1 = int.parse(n1string);
+	n2 = int.parse(n2string);
+	n1s = n1string.split("");
+	n1s1 = n1string.split(".")[0].split("");
+
+	for(x = 0; x < n1s1.length; x++) {
+		d = (int.parse(times10(carry.toString())) + int.parse(n1s1[x])) ~/ n2;
+		res+= d.toString();
+		carry = int.parse(times10(carry.toString())) + int.parse(n1s1[x]) - n2 * d;
+	};
+
+	if(res.length==0) {
+		res = "0";
+		x++;
+	};
+
+	dotx = x;
+	res+= ".";
+	carries = [carry];
+
+	while(n1s.length <= x)
+		n1s.add("");
+
+	while(true) {
+		x++;
+		if(x >= n1s.length) {
+			if(rcount==null)
+				rcount = 0;
+			else
+				rcount++;
+			over = true;
+			n1s.add(r[rcount % r.length]);
+		};
+
+		newcarry = (int.parse(times10(carry.toString())) + int.parse(n1s[x])) - n2 * ((int.parse(times10(carry.toString())) + int.parse(n1s[x])) ~/ n2);
+
+		if((newcarry==0 && r=="0") || List.generate(carries.length, (int y) => y).any((y) => carries[y]==newcarry && (y % r.length)==((x - dotx) % r.length)))
+			res+= ((int.parse(times10(carry.toString())) + int.parse(n1s[x])) ~/ n2).toString();
+		if(newcarry==0 && r=="0")
+			return sign+res.replaceAll(RegExp(r'^0+|0$'), "").replaceFirst(RegExp(r'^\.'), "0.").replaceFirst(RegExp(r'\.$'), "");
+		if(List.generate(carries.length, (int y) => y).any((y) => carries[y]==newcarry && (y % r.length)==((x - dotx) % r.length)))
+			return sign+(res.substring(0, dotx + List.generate(carries.length, (int y) => y).firstWhere((y) => carries[y]==newcarry && (y % r.length)==((x - dotx) % r.length)) + 1)+rstr1+res.substring(dotx + List.generate(carries.length, (int y) => y).firstWhere((y) => carries[y]==newcarry && (y % r.length)==((x - dotx) % r.length)) + 1)+rstr2).replaceFirst(RegExp(r'^0+'), "").replaceFirst(RegExp(r'^\.'), "0.");
+
+		res+= ((int.parse(times10(carry.toString())) + int.parse(n1s[x])) ~/ n2).toString();
+		carry = newcarry;
+		if(over)
+			carries.add(carry);
+	};
+}
+
+void main(List<String> args) {
+	int r;
+	double n1, n2;
+
+	if(args.length < 2 || !RegExp(r'^\d*\.?\d+$').hasMatch(args[0]) || !RegExp(r'^\d*\.?\d+$').hasMatch(args[1]) || (args.length > 2 && !RegExp(r'^\d+$').hasMatch(args[2]))) {
+		print("Usage: advdiv n1 n2[ r]");
+		return;
+	};
+
+	n1 = double.parse(args[0]);
+	n2 = double.parse(args[1]);
+	r = args.length < 3 ? 0 : int.parse(args[2]);
+
+	print(advdiv(n1, n2, r) ?? "Error");
+}