8.4.15

#include <iostream>

using namespace std;

float F(float x) {
    if (x - 1 == 1) {
        return 0;
    }
    else if (x - 1 < 1) {
        return 1;
    }
    else if (x - 1 > 1) {
        return -1;
    }
}

void F(float x, float& y) {
    if (x - 1 == 1) {
        y = 0;
        cout << y;
    }
    else if (x - 1 < 1) {
        y = 1;
        cout << y;
    }
    else if (x - 1 > 1) {
        y = -1;
        cout << y;
    }
}

int main() {
    for (float i = 1.0; i < 4; i++) {
        cout << F(i) << " ";
        float y = 0;
        F(i, y);
        cout << endl;
    }
}