ubuntu install jsoncpp and demos,StyledWriter,FastWriter,Reader,parse

sudo apt-get install libjsoncpp-dev

#include <jsoncpp/json/json.h>

#include <algorithm>
#include <chrono>
#include <ctime>
#include <fstream>
#include <iostream>
#include <sstream>
#include <string>
#include <string.h>
#include <thread>
#include <unistd.h>
#include <uuid/uuid.h>
#include <vector> 
#include <jsoncpp/json/json.h>

using namespace std;
using namespace Json;

char* uuidValue=(char*)malloc(40);
char* getUuid()
{
    uuid_t newUUID;
    uuid_generate(newUUID);
    uuid_unparse(newUUID,dtValue);
    return dtValue;
}


void jsonCppDemo2()
{
    Json::Value fromScratch;
    Json::Value array;
    array.append("hello");
    array.append("world");
    fromScratch["hello"]=getUuid();
    fromScratch["num"]=UINT64_MAX;
    fromScratch["array"]=array;
    fromScratch["object"]["hello"]=getUuid();
    cout<<fromScratch<<endl;

    Json::StyledWriter styledWriter;
    cout<<endl<<"StyledWriter:"<<endl<<styledWriter.write(fromScratch)<<endl;


    Json::FastWriter fastWriter;
    string jsonValue=fastWriter.write(fromScratch);
    cout<<endl<<"FastWriter:"<<endl<<jsonValue<<endl;

    Json::Value parsedFromString;
    Json::Reader reader;
    bool parsed= reader.parse(jsonValue,parsedFromString);
    if(parsed)
    {
        cout<<endl<<"ParsedFromString:"<<endl<<styledWriter.write(parsedFromString)<<endl;
    }   
}

int main(int args,char **argv)
{
    jsonCppDemo2();
}

g++ -g -std=c++2a -I. *.cpp -o h1 -luuid -lpthread -ljsoncpp

./h1