How to create a dynamic array of integers

Question

How to create a dynamic array of integers in C   using the new keyword

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dynamically allocate some memory using new   int  array   new int SIZE

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You might want to consider using the Standard Template Library    It s simple and easy to use  plus you don t have to worry about memory allocations   http   www cplusplus com reference stl vector vector   int size   5                        declare the size of the vector vector lt int gt  myvector size  0        create a vector to hold  size  int s                                     all initialized to zero myvector 0    1234                  assign values like a c   array

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int main       int size     std  cin  gt  gt  size     int  array   new int size      delete    array     return 0      Don t forget to delete every array you allocate with new

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Since C  11  there s a safe alternative to new   and delete   which is zero-overhead unlike std  vector   std  unique ptr lt int   gt  array new int size      In C  14   auto array   std  make unique lt int   gt  size     Both of the above rely on the same header file   include  lt memory gt

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include  lt stdio h gt   include  lt cstring gt   include  lt iostream gt   using namespace std   int main          float arr 2095879       long k i      char ch 100       k 0       do          cin gt  gt ch          arr k  atof ch           k          while ch 0    0         cout lt  lt  Array output  lt  lt endl      for i 0 i lt k i             cout lt  lt arr i  lt  lt endl             return 0      The above code works  the maximum float or int array size that could be defined was with size 2095879  and exit condition would be non zero beginning input number

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As soon as question is about dynamic array you may want not just to create array with variable size  but also to change it s size during runtime  Here is an example with memcpy  you can use memcpy s or std  copy as well  Depending on compiler   lt memory h gt  or  lt string h gt  may be required  When using this functions you allocate new memory region  copy values of original memory regions to it and then release them         create desired array dynamically size t length  length   100    for example int  array   new int length         now let s change is s size - e g  add 50 new elements size t added   50  int  added array   new int added          somehow set values to given arrays            add elements to array int  temp   new int length   added   memcpy temp  array  length   sizeof int    memcpy temp   length  added array  added   sizeof int    delete   array  array   temp    You may use constant 4 instead of sizeof int

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int  array   new int size

[c++] How to create a dynamic array of integers

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