diff --git a/a1/program.c b/a1/program.c
index a024032..830ff1c 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
+	if (c == '(' || c == '[' || c == '{' || c == '<') return 1;
 }
 
 int isClosing(char c){
-	if (c == ')' || c == ']' || c == '}' || c == '>') return 1
+	if (c == ')' || c == ']' || c == '}' || c == '>') return 1;
 }
 
 char expectedCLosing(char c){
@@ -47,7 +47,7 @@ int main(){
 
 	int len = strlen(code);
 	for (int i = 0; i < len; i++){
-		c = code[i];
+		char c = code[i];
 
 		if (isOpening(c)){
 			if (top < MAX_LEN - 1){