C / C++ / MFC

string remove(const string& src,const string& chars)
{
  string dst;
  for(string::size_type off=0,off2=0;(off=src.find_first_of(chars,off2))!=string::npos; ){
    off2=src.find_first_not_of(src,off);
    dst+=src.substr(off,off2==string::npos?string::npos:off2-off);
  }
  return dst;
}

cin >> size;

//allocate space for your array.
int *arrayvalue = new int[size];
// it is a good idea to check the return value from a call to new.
// the return value from new is NULL of the memory allocation fails.
if (NULL == arrayvalue)
{
  // handler this error here.
}
else
{
  // use your array like you would any other array.
  arrayvalue[0] = 100;
  ...

  //free the memory for your array later with this call.
  delete[] arrayvalue;
}

#include <vector>
std::vector<int> v;
int size;
cin >> size;
v.resize(size);

int g_Temp;

extern int g_Temp;

// (1) in .h file
extern int g_Temp;

// (2) in exactly one of .c/.cpp files
int g_Temp = 0;