Notation

#include <iomanip>
#include <iostream>
using namespace std;

int main() {
    // Example values
    double A = 100.345;
    double B = 2006.008;
    double C = 2331.41592653498;

    // Output for A: hexadecimal representationx
    cout << hex << left << showbase << nouppercase << (long long)A << endl;

    // Output for B: formatted to 2 decimal places, right justified
    cout << dec << right << setw(15) << setfill('_') << showpos << fixed << setprecision(2) << B
         << endl;

    // Output for C: scientific notation with 9 decimal places
    cout << scientific << uppercase << noshowpos << setprecision(9) << C << endl;

    return 0;
}