add exit function

@@ -4,8 +4,11 @@ int main(){
 	string data;
 	string data;
 	cout << "input : ";
 	cout << "input : ";
 	cin >> data;
 	cin >> data;
+	if(data == "exit"){
+		exit(100);
+	}
 	cout << "print : "<<data;
 	cout << "print : "<<data;
-
+	
 
 
 	return 0;
 	return 0;
 }
 }
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