Malloc() Function - Dynamic Allocation

How to allocate memory block using malloc()in C++?


Malloc() function, dynamic allocation, returns a pointer to the first byte of memory location of the specified "size" allocated from the heap. If there is no sufficient space the function returns a "NULL" pointer. It performs Dynamic Memory Allocation at run time.


void *malloc(size_t size);

Example :

#include <stdlib.h>
#include <stdio.h>
int main ()
int * ptr;
ptr = (int*) malloc (80*sizeof(int));
if( ptr== NULL )
{printf( "Insufficient memory\n" );}
{printf( "Memory block allocated\n" );}

Result :

Memory block allocated

In the above example, first the memory is allocated, then its checked using a "if" loop. Thus to allocate memory block this function can be used. This is the malloc() function of dynamic allocation.

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