cmd/perc/main.go: try RPN parsing before percentage calculation in command mode

- Bare expressions like '1 2 +' now work without 'calc' prefix
- Assignment format 'name value =' requires 'calc' subcommand prefix

1 files changed, 9 insertions, 1 deletions

diff --git a/internal/repl/repl.go b/internal/repl/repl.go
index 79a94f4..ed39755 100644
--- a/internal/repl/repl.go
+++ b/internal/repl/repl.go
@@ -51,7 +51,15 @@ func executor(input string) {
 		return
 	}
 
-	// Run the calculation
+	// Try RPN parsing first (for bare RPN expressions like "3 4 +")
+	rpnResult, rpnErr := runRPN(input)
+	if rpnErr == nil {
+		// Valid RPN expression - print result
+		fmt.Println(rpnResult)
+		return
+	}
+
+	// Run the percentage calculation
 	result, err := calculator.Parse(input)
 	if err != nil {
 		fmt.Printf("Error: %v\n", err)