1 files changed, 16 insertions, 0 deletions
diff --git a/func.go b/func.go
index 8fe3f0d..fee20da 100644
--- a/func.go
+++ b/func.go
@@ -12,6 +12,10 @@ func parseFunction(fn string) func(Calculator) {
 		return trig(fn)
 	case "asin", "acos", "atan":
 		return invTrig(fn)
+	case "deg":
+		return deg
+	case "rad":
+		return rad
 	}
 	return nil
 }
@@ -65,6 +69,18 @@ func invTrig(fn string) func(Calculator) {
 	}
 }
 
+func deg(c Calculator) {
+	if len(c.stack) > 0 {
+		c.stack[len(c.stack)-1] = degrees(c.stack[len(c.stack)-1])
+	}
+}
+
+func rad(c Calculator) {
+	if len(c.stack) > 0 {
+		c.stack[len(c.stack)-1] = radians(c.stack[len(c.stack)-1])
+	}
+}
+
 // radians converts degrees to radians.
 func radians(deg float64) float64 {
 	return deg * math.Pi / 180.0