What is dangling pointer

The following code snippet illustrate the idea of dangling pointers

	#include <iostream>
	#include <cstdlib>
	using namespace std;
	int main(int argc, char** argv) {
	int *p=(int*)malloc(sizeof(int));
	*p=1;
	/*
	* now p is an integer pointer pointes to space(4 bytes)allocated
	* by malloc function , also the allocated space is initilized by 1
	*/
	cout<<*p<<endl;//result will be 1
	//now we will free or deallocate reserved 4 bytes
	free(p);
	/*
	* now p is a dangling pointer , pointes to deallocated space
	* so data at this pointer is garbage
	*/
	cout<<*p;// output will be garbage
	return 0;
	}

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