Help with a piece of code

This code is meant to have input as a string, and output as a float, but it returns strange numbers. I guess it is something with the converter function at the beginning. Could someone please tell me what's wrong?
here is the code (it's modified, but it conveys the problem)

Code:

---

#include <cstdlib>
#include <iostream>
#include <conio.h>
#include <sstream>
#include <string>
#include <stdexcept>

using namespace std;
 class BadConversion : public std::runtime_error {
 public:
  BadConversion(const std::string& s)
    : std::runtime_error(s)
    { }
 };

    inline float convertToFloat(const std::string& s)
 {
  std::istringstream i(s);
  float x;
  if (!(i >> x))
    throw BadConversion("convertToFlaot(\"" + s + "\")");
  return x;
};
int main()
{
string w;
string q;
string x;
string y;
string m;
float wint;
float qint;
float n;
char keyPressw;
char keyPressq;
char keyPressx;
char keyPressy;
cout<<"Input your first point:(";
do {
    keyPressw=getch();
    if ( keyPressw != char(13)){
        w+=keyPressw;
        cout<<keyPressw;
        }
        } while ( keyPressw != char(13));
cout<<",";
do {
    keyPressq=getch();
    if ( keyPressq != char(13)){
        q+=keyPressq;
        cout<<keyPressq;
        }
        } while ( keyPressq != char(13));
cout<<")";
cout<<"Input your second point:(";
do {
    keyPressx=getch();
    if ( keyPressx != char(13)){
        x+=keyPressx;
        cout<<keyPressx;
        }
        } while ( keyPressx != char(13));
cout<<",";
do {
    keyPressy=getch();
    if ( keyPressy != char(13)){
        y+=keyPressy;
        cout<<keyPressy;
        }
        } while ( keyPressy != char(13));
cout<<")\n";
wint==convertToFloat(w);
qint==convertToFloat(q);
wint-qint==n;
cout<<qint<<"and"<<wint;
cin.get();
}

---

Remember the difference between assignment (=) and equality (==).

Also remember that when assigning a value, the variable you are updating should be on the left side of the equation.