#include <stdio.h>

void table ( int start, int endw, int step )
{
    printf ("+-------------------+\n");
    printf ("|    x    |    y    |\n");
    printf ("+---------+---------+\n");
    
    if (step < 1)
        step=1;
    for (int i=start; i<=endw; i+=step)
    {
        printf ("| %7d | %7d |\n", i, (2*(i*i)+4*i+3));
    }
    printf ("+---------+---------+\n");
}

int main ()
{
    table ( -20, 20, 1);
}