Что не так с кодом?
#include <iostream>
using namespace std;

int main() {}
float a, b;
cin >> a, b;
int sum, min, umn, del, ost;
sum=a+b;
min=a-b;
umn=a*b;
del=a/b;
ost=a%b;
cout << a << "+" << b << "=" << sum << endl;
cout << a << "-" << b << "=" << min << endl;
cout << a << "*" << b << "=" << umn << endl;
cout << a << "/" << b << "=" << del << "(ост." << ost << ")";

return 0;
}​