diff --git a/a1/program.c b/a1/program.c
index 830ff1c..f55cf4a 100644
--- a/a1/program.c
+++ b/a1/program.c
@@ -4,11 +4,11 @@
 #define MAX_LEN 100
 
 int isOpening(char c){
-	if (c == '(' || c == '[' || c == '{' || c == '<') return 1;
+	return (c == '(' || c == '[' || c == '{' || c == '<');
 }
 
 int isClosing(char c){
-	if (c == ')' || c == ']' || c == '}' || c == '>') return 1;
+	return (c == ')' || c == ']' || c == '}' || c == '>');
 }
 
 char expectedCLosing(char c){
@@ -27,6 +27,7 @@ char expectedOpening(char c){
 		case ']': return '[';
 		case '}': return '{';
 		case '>': return '<';
+		default: return '?';
 	}
 }