How to print JSON value in c++

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Hello,

I wanna ask about Json in c++.
How can I print Json value in c++,

Let's say that I have this Json :

{
   "nameS" : "Jason",
   "ageS"  : "16"
}

How can I print "He's Jason" or "16 years old".

I already tried these :

void printmyJson(Json::Value ¶ms)
{
....
Json::Value root;
std::string name;
std::string age;
std::string mName;
for(Json::ValueIterator it = params.begin(); it!= params.end(); ++it)
{
 mName = it.memberName();
 name = root.get(mName,0).asString.c_str();
}

printf("He's %s",name\n);
printf("He is %s",mName);
....
}

But it always output this :
"He's "
"He's name"

So, the variable name is NULL instead of it's value (Jason). And variable mName is filled with Json string instead of(which I wanted)it's value (Jason).

Can someone help me on this?

many thanks