Thread: Data Types

Hello. Struggling with getting my head around data types. Clearly a newcomers question, but why does this produce 4.2*10^9?

Code:

// playing with variables

#include <iostream>
using namespace std;

int main()
{
    int a(2);
    unsigned int b(3);
    float result;
    result=a-b;
    cout<<result;
    return 0;
}

Thanks. Feel free to insult the sheer ignorance.