fstream only reading integers - c++

Question

My code works fine when the file Im reading from only contains ints, but when I have floats in the file it doesnt seem to work, for example if I have 1.5 in the file it will only read it as 1 and it wont read any of the numbers after it.
Anyone knows whats causing this? The dynamic array where everything is saved in is a float so Im not sure what to do at this point
#include <iostream>
#include <fstream>
#include <string>
float *allocateArray(std::string fileName, int &arraySize, int &counter)
{
int a = 0;
std::ifstream myReadFile;
myReadFile.open(fileName);
float *arr = new float[arraySize]{0.0};
while (myReadFile >> a)
{
counter++;
if(counter == arraySize)
{
arr[arraySize -1] = a;
}
else
{
float *tempArray = new float[arraySize +1]{0.0};
for(int i = 0; i < arraySize; i++)
{
tempArray[i] = arr[i];
}
delete[] arr;
arraySize++;
arr = new float[arraySize];
for(int x = 0; x < arraySize; x++)
{
arr[x] = tempArray[x];
}
arr[arraySize-1] = a;
}
}
myReadFile.close();
return arr;
}
void output(float *arr, int arraySize,int counter)
{
float sum = 0.0;
for(int x = 0; x < arraySize; x++)
{
sum += arr[x];
}
float average = sum/counter;
std::cout << "Output: ";
for(int i = 0; i < arraySize; i++)
{
if(arr[i] > average)
{
std::cout << arr[i] << " ";
}
}
}
int main()
{
int arraySize = 1;
int counter = 0;
float *arr = allocateArray("input.in", arraySize, counter);
std::cout << "Input: ";
for(int x = 0; x < arraySize; x++)
{
std::cout << arr[x] << " ";
}
output(arr, arraySize, counter);
getchar();
return 0;
}