#include<iostream>

#include<vector>

#include<string>

#include<map>

#include<unordered_map>

using namespace std;

using ll = long long;

#define pb push_back

#define f first

#define s second

//Some predefined templates

template <typename T>

ostream& operator <<(ostream& out, const vector<T>& a) {

out << "["; bool first = true;

for (auto v : a) { out << (first ? "" : ", "); out << v; first = 0;}

out << "]";

return out;

}

template <typename U, typename T, class Cmp>

ostream& operator <<(ostream& out, const map<U, T, Cmp>& a) {

out << "{"; bool first = true;

for (auto& p : a) { out << (first ? "" : ", "); out << p.first << ":" << p.second; first = 0;} out << "}";

return out;

}

template <typename U, typename T, class Cmp>

ostream& operator <<(ostream& out, const unordered_map<U, T, Cmp>& a) {

out << "{"; bool first = true;

for (auto& p : a) { out << (first ? "" : ", "); out << p.first << ":" << p.second; first = 0;} out << "}";

return out;

}

int to_int(string& s) {

int res = 0;

for(char c : s) {

res = res * 10 + (c - '0');

}

return res;

}

int main()

{

int nValue = 5;

void *pVoid = &nValue;

// can not dereference pVoid because it is a void pointer

int *pInt = static_cast<int*>(pVoid); // cast from void* to int*

cout << *pInt << endl; // can dereference pInt

*pInt = 10;

cout << nValue<<endl;

return 0;

}