OpenSCAD

functions: module name(args){}

cube([x, y, z], center = true);

square([x, y], center = true);

union()       {square(10);circle(10);} // square or circle
difference()  {square(10);circle(10);} // square and not circle
intersection(){square(10);circle(10);} // square and circle

rotate([45,45,45])
translate([10,20,30])
scale([0.5,1,2]) 
resize([2,2,0]) cube();
rotate([0, b, c]) cylinder(h=length, r=0.5);

linear_extrude(height = 50)