c++ - Trying to dynamically increase array size -

i working on program user keeps entering numbers, saved array, when array full trying copy original array new 1 one , continue fill array cannot work @ all. here code far

#include <iostream> #include <stdio.h> #include <string.h> using namespace std;  int main() {     int size;         cout << "please enter how many numbers want enter: ";     cin >> size;      double *array = new double*[size];     cout << "please enter numbers: ";     for(int = 0; < size; i++) {         cin >> array[i];         if(i == size-1) {             int newsize = 2*size;             double *arrayb = new double*[newsize];             for(int = 0;i<size;i++) {                 arrayb[i] = array[i];             }             delete [] array;             array = arrayb;             size = newsize;         }     }    } 

i can compile making double pointers point @ doubles, instead of arrays of double pointers

int size; cout << "please enter how many numbers want enter: "; cin >> size;  double *array = new double[size]; //                        ^--- not pointers doubles cout << "please enter numbers: "; for(int = 0; < size; i++) {     cin >> array[i];     if(i == size-1) {         int newsize = 2*size;         double *arrayb = new double[newsize];         //                         ^--- not pointers         for(int = 0;i<size;i++) {             arrayb[i] = array[i];         }         delete [] array;         array = arrayb;         size = newsize;     } }  

you have allocated enough memory in first new data. but whn 1 before end of current value of size double space allocate. , make size = newsize. outer for loop never end, unless exception gets thrown, example bad::alloc bound happen eventually.