import math;
import fileio;
import standard;

fn circle(radius: int, centerX: int, centerY: int) {
    for (var y: int = 0; y <= 2 * radius; y++) {
        for (var x: int = 0; x <= 2 * radius; x++) {
            var distance: int = round(sqrt((x - radius) * (x - radius) + (y - radius) * (y - radius)));

            if (distance <= radius) {
                output.write("*");
            } else {
                output.write(" ");
            }
        }

        output.write("\n");
    }
}

fn triangle(height: int) {
    for (var i: int = 1; i <= height; i++) {
        for (var j: int = 1; j <= height - i; j++) {
            output.write(" ");
        }

        for (var j: int = 1; j <= 2 * i - 1; j++) {
            output.write("*");
        }

        output.write("\n");
    }
}

fn square(size: int) {
    for (var i: int = 0; i < size; ++i) {
        for (var j: int = 0; j < size; ++j) {
            output.write("* ");
        }

        output.write("\n");
    }
}

for (;;) {
    output.write("Enter:\n0\tfor circle\n1\tfor triangle\n2\tfor square\n> ");
    var result: any = input.read(int);

    if (result == 0) {
        circle(5, 5, 5);
    }
    else if (result == 1) {
        triangle(5);
    }
    else if (result == 2) {
        square(5);
    }
    else {
        output.write("invalid input :(\n");
    }
}