# HG changeset patch
# User Paul (paul.d.anderson@comcast.net)
# Date 1269406463 25200
# Node ID c991b9fde45cc095e6bb6be62b4d737c9311bbb9
# Parent  b304232c476c6fb4790e1280d4c3b1758b3764d1
added rounding (partially implemented)

diff -r b304232c476c -r c991b9fde45c src/decimal/bcd.d
--- a/src/decimal/bcd.d	Tue Mar 23 20:50:07 2010 -0700
+++ b/src/decimal/bcd.d	Tue Mar 23 21:54:23 2010 -0700
@@ -1187,12 +1187,6 @@
 }
 
 public Bcd truncate(const Bcd a, int n) {
-/+	if (n <= 0) return ZERO.dup;
-	if (n >= a.numDigits) return a.dup;
-	Bcd b;
-	b.digits = a.digits[$-n..$].dup;
-	b.sign = a.sign;
-	return b;+/
 	Bcd dummy;
 	return truncate(a, n, dummy);
 }
@@ -1486,6 +1480,72 @@
 	writeln("passed");
 }
 
+/**
+ * Rounds the specified integer to the specified number of digits.
+ * The rounding mode governs the method of rounding.
+ */
+public Bcd round(Bcd a, int n, Rounding mode) {
+	Bcd r;
+	Bcd b = truncate(a, n, r);
+	return b;
+}
+
+/**
+ * Rounds the (truncated) integer based on its remainder and the rounding
+ * mode.
+ */
+public Bcd round(Bcd a, Bcd r, Rounding mode) {
+	Bcd b = a.dup;
+	switch (mode) {
+		case Rounding.DOWN:
+			return b;
+
+		case Rounding.HALF_UP:
+			if (r.firstDigit >= 5) b++;
+			return b;
+
+		case Rounding.HALF_EVEN:
+/+			BigInt test = 5 * pow10(numDigits(remainder,1)-1);
+			int result = remainder.opCmp(test);
+			if (result > 0) {
+				increment(number.ceff);
+				return;
+			}
+			if (result < 0) {
+				return;
+			}
+			// if last digit is odd...
+			if (lastDigit(number.ceff) & 1 == 1) {
+				increment(number.ceff);
+			}+/
+			return b;
+			
+		case Rounding.CEILING:
+			if (!b.isSigned && !r.isZero) b++;
+			return b;
+			
+		case Rounding.FLOOR:
+			if (b.isSigned && !r.isZero) b++;
+			return b;
+			
+			// TODO: is this one right? what about 55...
+		case Rounding.HALF_DOWN:
+			if (r.firstDigit > 5) b++;
+			return b;
+			
+		case Rounding.UP:
+			if (!r.isZero) b++;
+			return b;
+	}
+	return b;
+}
+
+unittest {
+	write("rounding.......");
+	writeln("passed");
+}
+
+
 //==========================================
 
 public void main() {