#include <stdio.h>
#include <math.h>
 
int main() 
{
    double a = 2.5;
    double b = 0.4;
    double y;
 
    double t_start = -1.0;
    double t_end = 1.0;
    int points = 50;
    printf("y\n");
    for (int i = 0; i < points; i++) 
    {
        double t = t_start+((t_end-t_start)/(points))*i;
 
        if (t<-0.1)
        {
        	y = pow(a * t * t + b * sin(t) + 1, 0.5);
        }
 
        else if (t >= -0.1 && t <= 0.5)
        {
        	y = a * t + b;
        }
 
        else
        {
        	y = pow(a * t * t + b * cos(t) + 1, 0.5);
        }
 
        printf("%d %f\n", y, i+1);
    }
 
    return 0;
}

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