From ee56cc539398a7fc1664f39cf16428fa13c262c9 Mon Sep 17 00:00:00 2001
From: Sam Anthony <sam@samanthony.xyz>
Date: Tue, 25 Jun 2024 16:16:00 -0400
Subject: clean up operands()

---
 calc.go | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/calc.go b/calc.go
index 25756fc..2fb1699 100644
--- a/calc.go
+++ b/calc.go
@@ -69,16 +69,16 @@ func (c *Calculator) performOperation(operator byte) error {
 
 // operands returns the left and right operands, or error if there are not enough.
 func (c *Calculator) operands() (lhs, rhs float64, err error) {
-	if rhs, err := c.parseBuffer(); err == nil {
+	if rhs, err = c.parseBuffer(); err == nil {
 		lhs, err = c.stack.pop()
-		return lhs, rhs, err
-	} else if stk, err := c.stack.pop(); err == nil {
-		rhs = stk
-		if lhs, err = c.stack.pop(); err == nil {
-			return lhs, rhs, nil
+		return
+	} else if rhs, err = c.stack.pop(); err == nil {
+		lhs, err = c.stack.pop()
+		if err != nil { // missing lhs
+			c.stack.push(rhs)
 		}
-		c.stack.push(rhs)
-	} // not enough operands
+		return
+	}
 	return 0, 0, OperandErr{}
 }
 
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