Added bit shift

main.go

@@ -80,7 +80,10 @@ func onPress (button stone.Button) {
 		redraw()
 		application.Draw()
 		
-	case '+', '-', '*', '/', 'p', 'r', '%', '|', '~', '&', '^', 'm':
+	case
+		'+', '-', '*', '/', 'p', 'r', '%', '|', '~', '&', '^', 'm',
+		'<', '>':
+		
 		insertOperation(rune(button))
 		redraw()
 		application.Draw()
@@ -232,6 +235,8 @@ func insertOperation (symbol rune) {
 	case '~': opcode = OpcodeNot
 	case '&': opcode = OpcodeAnd
 	case '^': opcode = OpcodeXor
+	case '<': opcode = OpcodeLeftShift
+	case '>': opcode = OpcodeRightShift
 	case 'm': opcode = OpcodeMean
 	}
 
@@ -341,6 +346,9 @@ func drawInput () {
 
 func drawNumberReadouts () {
 	_, height := application.Size()
+	
+	clear(0, height - 10, 25, 10)
+		
 	var number int64
 	var err error
 	if selectedExpression != nil {
@@ -348,7 +356,6 @@ func drawNumberReadouts () {
 	}
 
 	if err != nil {
-		clear(0, height - 10, 25, 10)
 		application.SetDot((25 - len(err.Error())) / 2, height - 6)
 		fmt.Fprint(application, err.Error())
 	} else {