#include <iostream>
#include <bitset>
using namespace std;
unsigned
invert(unsigned x, int p, int n)
{
    int count = sizeof(x) * 8;
    unsigned t = ((unsigned) ~0 << (p - 1)) >> (count - n) << (count - n - p + 1);
    return (~x & t) | (x & ~t);
}
 
int
main()
{
    unsigned x;
    int p, n;
    cout << "Введите x в шестнадцатеричной: ";
    cin >> hex >> x;
    cout << "Введите p позицию и число инвертированных битов n ";
    cin >> dec >> p >> n;
    cout << "Исходный x " << bitset<sizeof(x) * 8>(x) << endl
         << "Инвертированный x " << bitset<sizeof(x) * 8>(invert(x, p, n)) << endl;
    return 0;
}

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1 1