Why I don't get the correct output in c++?

Question

#include <iostream>
using namespace std;

Int main()
{
char op;
float num1, num2;

cin >> op;

cin >> num1 >> num2;
{

cout << num1 + num2;
break;

cout << num1 - num2;
break;

cout << num1 * num2;
break;

cout << num1 / num2;
break;

cout << "Error! operator is not correct";
break;
}

return 0;
}

Answer 1

What output are you expecting?

Answer 2

Also:
1. "Int" is not valid. You hopefully want "int".
2. What are the "break" statements for?
3. What is variable "op" for?