Sunday, July 17, 2011

Dynamic Memory Allocation in C


Dynamic Memory allocation is the process of allocating memory to program in runtime.

The various dynmaic memory allocation functions available in C are
  • Malloc:Allocates specified number of bytes un memory and returns the pointer to the first byte allocated.

           pointer=(cast-type*)malloc(size in bytes)

  • Calloc:Creates more than one block of memory and returns the pointer to the first byte in the first block.
          pointer=(cast-type*) calloc(n,size in bytes)

          Here n refers to the number of blocks

  • realloc:Used to reallocate a previous allocated memory area.

           pointer=realloc(new pointer,newsize);

  • free:Used to clear previously allocated memory so that memory is used efficiently.

          free(pointer name);

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