#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>

using namespace std;


int main(int argc, char * argv[]) {
    float a = 12.123456;
    float b = 12.125100;

    cout << a << " " << b << " " << endl;
    cout << setiosflags(ios::fixed) << setprecision(2) << a << " " << b << " " << endl;

    printf("%0.2f %0.2f\n", a, b);
    fprintf(stdout, "%0.2f %0.2f\n", a, b);
    fprintf(stderr, "%0.2f %0.2f\n", a, b);

    double input;
    cin >> input;
    double intpart = 0;
    double fracpart = modf(input, &intpart);
    printf("%f %f\n", intpart, fracpart);

    if (fracpart == 0.5) {
        cout << "exactly 0.5" << endl;
    }
    else {
        cout << "not exactly 0.5" << endl;
    }

    return 0;
}