#includeIn the above example, the isInt function is used to check if the age attribute in the json object is an integer. If it is, then the program prints "The age is an integer." Otherwise, it prints "The age is not an integer." The package library used in the example is jsoncpp, which is a C++ library for interacting with JSON data.#include int main() { std::string input = "{\"name\":\"John\",\"age\":30}"; Json::Value root; Json::Reader reader; bool parsingSuccessful = reader.parse(input, root); if (parsingSuccessful) { if(root["age"].isInt()) { std::cout << "The age is an integer." << std::endl; } else { std::cout << "The age is not an integer." << std::endl; } } return 0; }