#define _CRT_SECURE_NO_WARNINGS

	#include <iostream>
	using namespace std;

	int main() {
		setlocale(LC_ALL, "Russian");

		// AND == &&
		// OR == ||
		// == !=
		float pi = acos(0) * 2;

		for (double i = -0.5; i <= 2; i = i + 0.25) {
			float x = i;
			if (x < 0) {
				printf("y(%f) = %f\n", x, x * x + 1);
			}
			if (x >= 0 && x <= pi / 2) {
				printf("y(%f) = %f\n", x, sin(x));
			}
			if (x > pi / 2) {
				printf("y(%f) = %f\n", x, x - 2.1);
			}
		}


		return 0;
	}