Code won't run, getting stuck at while loop - c++

Question

When I try to run the program visual studio code gets stuck at the while look and won't run the code. When copy and pasting the code to an online compiler the code runs. Also I can't use vectors or reverse from the library.
#include <iostream>
#include <iomanip>
#include <cmath>
#include <string>
#include <algorithm>
#include <cstdlib>
#include <sstream>
#include <fstream>
#include <ctime>
using namespace std;
void reverse(double* a, int size)
{
double* left = a;
double* right = a + size - 1;
while (left < right)
{
double temp = *left;
*left++ = *right;
*right-- = temp;
}
}
int main()
{
int size = 0;
float input;
double* a = new double[size];
int capacity = 10;
cout << "Please enter the values: ";
while (cin >> input)
{
if (cin.fail())
{
cin.clear();
}
if (size == capacity) {
capacity *= 2;
}
a[size++] = input;
if (size == capacity)
{
capacity *= 2;
double* b = new double[capacity];
for (int i = 0; i < size; i++)
{
b[i] = a[i];
}
delete[] a;
a = b;
}
}
cout << "The input values are: ";
for (int i = 0; i < size; i++)
{
cout << a[i];
if (i < size - 1)
cout << ", ";
}
cout << endl;
reverse(a, size);
cout << "The reversed values are: ";
for (int i = 0; i < size; i++)
{
cout << a[i] << " ";
if (i < size - 1)
cout << ", ";
}
cout << endl;
return 0;
}
I tried using a break command it didn't work. I'm expecting the code to run the function and take in all the inputs and print the array and its reverse

Answer 1

can you check if this is the answer you wanted, I made the input variable integer type where you were using float/double type, I thought it is the problem, also you did not update the input in the while loop so I used while(input--) . These are the changes I have made I do not know if this is the answer you wanted. I added the comment where I made changes to the code. Hope it is helpful.
#include <iomanip>
#include <cmath>
#include <string>
#include <algorithm>
#include <cstdlib>
#include <sstream>
#include <fstream>
#include <ctime>
using namespace std;
void reverse(double* a, int size)
{
double* left = a;
double* right = a + size - 1;
while (left < right)
{
double temp = *left;
*left++ = *right;
*right-- = temp;
}
}
int main()
{
int size = 0;
int input; // I made input variable integer type you were using float type
double* a = new double[size];
int capacity = 10;
cout << "Please enter the values: ";
cin >> input ; // took the value of the input variable here
while (input--) // you did not decrement the input variable
{
if (cin.fail())
{
cin.clear();
}
if (size == capacity) {
capacity *= 2;
}
a[size++] = input;
if (size == capacity)
{
capacity *= 2;
double* b = new double[capacity];
for (int i = 0; i < size; i++)
{
b[i] = a[i];
}
delete[] a;
a = b;
}
}
cout << "The input values are: ";
for (int i = 0; i < size; i++)
{
cout << a[i];
if (i < size - 1)
cout << ", ";
}
cout << endl;
reverse(a, size);
cout << "The reversed values are: ";
for (int i = 0; i < size; i++)
{
cout << a[i] << " ";
if (i < size - 1)
cout << ", ";
}
cout << endl;
return 0;
}```