protected String isExist(String name, Integer scope) {
        System.out.print(name + scope);
        String variableName = name + scope.toString();
        if(scope == 1) {
            if(!globals.hasSymbol(variableName)) {
                throw new RuntimeException("Variable " + variableName + " is not existing in global scope.");
            }
        } else {
                for(Integer i = scope; i >= locals.getMemorySize(); i--) {
                    String tempName = name + i.toString();
                    if(!locals.hasSymbol(tempName)) {
                        throw new RuntimeException("Variable " + name + " is not existing in local scope.");
                    }
                }
            }
        return variableName;
    }