What Exactly Is nullptr in C++

Let us understand the need of nullptr with help of an example. #include <iostream>using namespace std;class base {public: void display(int num) { cout << “Integer display: “ << num << endl; } void display(char* ptr) { cout << “ptr display: “ << ptr << endl; }}; int main() { base b; b.display(NULL); return 0; } The above code will not compiled. Below error will come: “In function int main(): 15:15: error: call of overloaded display(NULL) is ambiguous b.display(NULL); 15:15: note: candidates are: …