Answers for "when to use dynamic memory allocation i c++"

dynamic memory allocation in c

C Dynamic Memory Allocation can be defined as a procedure in which the size of a data structure (like Array) is changed during the runtime.
C provides some functions to achieve these tasks. There are 4 library functions provided by C defined under <stdlib.h> header file to facilitate dynamic memory allocation in C programming. They are: 
 

malloc()
calloc()
free()
realloc()