Why is static_cast not working and giving unexpected results in this code?

Question

#include <iostream>
using namespace std;

int main() {
int a{1};
int b{4};
unsigned int temp{};
temp = static_cast<unsigned int>(a-b);
cout << temp;
return 0;
}
In this code I want to get absolute difference of a and b using static_cast but it's not working and give same garbage answer in my pc terminal and in sololearn

Answer 1

Martin Taylor could u please tell me why static cast works for int to double conversion but not for signed int to unsigned int?