@Override
	public String toString() {
		switch(this) {
			case INT:
				return "int";
			case VOID:
				return "void";
			case UNDEFINED:
				return "undefined";
			case INTARRAY:
				return "int[]";
                        case BOOL:
                                return "boolean";
                        case FLOAT:
                                return "float";
		}
		
		return null;
	}