while y <= 19.75
x = 0
for x = xmin to xmax step x step
print "x =";
print x;
if y < 1 then
    to4ka = x-1
    print "   y = ";
    print to4ka
    else
    if x < 3 then
        to4ka = sqrt(1-(x-2)^2)
        print "   y = ";
        print to4ka
        else
        if x = 3 then
            print "   y = От 0 до -1"
            else
            if x < 4 then
            print "    y = -1"