Malloc() Function

We are daily using pointers for dynamic memory allocation. When we declare a pointer and allocates memory for a pointer we used malloc() function. Malloc() function is a c library function. In glibc we have malloc named directory. we can see malloc's definition or its working in file named malloc.c. Malloc() returns a void pointer. And we have to typecasting as pointer declaration which type of pointer we have taken like (int* ptr,char* ptr etc.) 

Example:

 int* ptr;	
	ptr = (int*)malloc(sizeof(int)*5)
	Here ptr is pointer to an integer which will allocate 5 bytes for an integer. here (int*) used for typecasting. Because malloc always returns (VOID*)
#include
#include
int main()
{	
  	int* ptr;
  	ptr = (int*)malloc(sizeof(int));
  	if(!ptr)
  	{
  		perror("malloc");
  		exit(EXIT_FAILURE);
  	}
    return 0;  
}
If malloc successfully allocates memory it will return a void pointer otherwise it will return NULL (memory not allocated) .