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Why are NULL pointers defined differently in C and C++?
In C++, a null pointer can be defined by as a null pointer constant is an integer constant expression with the value 0, like −
int*p = 0;
But in c, a null pointer can be defined by as a null pointer constant is an integer constant expression with the value 0 or such an expression cast to void*, like −
Int *p = 0;;
Or
int*p = (void*) 0;
In C++11 a keyword “nullptr” is used to represent nullpointer.
int* ptr = nullptr;
In C
Example
#include <stdio.h>
int main() {
int *p= NULL; //initialize the pointer as null.
printf("The value of pointer is %u",p);
return 0;
}Output
The value of pointer is 0.
In C++
Example
#include <iostream>
using namespace std;
int main() {
int *p= NULL; //initialize the pointer as null.
cout<<"The value of pointer is ";
cout<<p;
return 0;
}Output
The value of pointer is 0.
Updated on: 30-Jul-2019
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