Receiving error on a simple code and don't understand why?

[AbsentCloud]

I need to find the max of the values using an array. For some reason I receive this error:

error: invalid types `float[9][float]' for array subscript

#include <iostream>
using namespace std;
 
int main()
{
 
  const int SLOPES = 9;
  float nums[SLOPES] = {17.24, 25.63, 5.94, 33.92, 3.71, 32.84, 35.95, 18.24, 6.92};
 
  float i, max = nums[0];
 
  for (i = 1; i < SLOPES; i++)
    if (max < nums[i])
     max = nums[i];
 
  cout << "The maximum value is " << max << endl;
 
 return 0;
}
 

[weaknessforcats]

Array indexes must be integers. Element 4 or 5 makes sense but element 2.57 doesn't.

Your variable i needs to be an int.