#include <iostream>
#include <climits>

using namespace std;

int main() {
    int n = INT_MIN;
    int p = -n;
    uint32_t up = -n;
    uint64_t up2 = -n;

    cout << "n: " << n << endl;
    cout << "p: " << p << " up: " << up << " up2: " << up2 << endl;
    return 0;
}

Result:
n: -2147483648
p: -2147483648 //because -INT_MIN = INT_MIN for signed integer
up: 2147483648 //because up is unsigned int from 0 to 4,294,967,295 (2^32 − 1)

up2: 18446744071562067968  //Question here. WHY up2 != up (2147483648)???

n = 0x80000000
p=0x80000000
up=0x80000000
up2=0xFFFFFFFF80000000