#include <stdio.h>
#include <stdlib.h>
#include <math.h>

#define MAX_SIZE 100

double f ( double x )
{
    // return sin(2 * M_PI * x);
    return sin(4 * M_PI * x);
    // return sqrt(0.25-pow(x-0.5,2));
    // return exp(x);
    // return sqrt(x);
    // return x * x;
    // return x / (x * x + 1);
    // return pow(x,x);
    // return pow(x,-x);
}

int main ( )
{
    int N = 80, L = 20, i, j;
    double h, v, A[MAX_SIZE], min, max;
    char img[MAX_SIZE][MAX_SIZE];

    h = 1 / (double)N;
    for (i=0; i<=N; ++i) A[i] = f(i*h);

    max = min = A[0];
    for (i=1; i<=N; ++i) {
        if (A[i] > max) max = A[i];
        if (A[i] < min) min = A[i];
    }
    if (max == min) exit(1);

    v = (max - min) / L;

    for (i=0; i<L; ++i) {
        for (j=0; j<=N; ++j) img[i][j] = ' ';
        img[i][N+1] = '\0';
    }

    for (j=0; j<=N; ++j) {
        // i = round((A[j] - min) / v);
        i = ((A[j] - min) / v);
        if (i >= L) i = L - 1;
        img[i][j] = 'X';
    }

    printf("%lf\n", max);
    for (i=L-1; i>=0; --i) printf("%s\n", img[i]);
    printf("%lf\n", min);

    exit(0);
}