Weird Math

/* define a few useful functions */ Math.rand = function(l) { return Math.floor(Math.random()*l); }; String.prototype.randomChar = function() { var pos = Math.rand(this.length); return this.charAt(pos); }; function printbr(str) { return print(str+"<br>"); } /* contrived function to use closures. */ function oper(op, y) { switch (op) { case '+': return function(x) { return x+y; }; case '-': return function(x) { return x-y; }; case '/': return function(x) { return x/y; }; case '*': return function(x) { return x*y; }; case '%': return function(x) { return x%y; }; case 'r': return function(x) { return oper("+-/*%".randomChar(), y)(x); }; default: print("not idea what to do with ["+op+"]<br>"); return function(x) { return x; }; } } var mod256 = oper("%", 256); var inc = oper("+", 1); var half =oper("/", 2); printbr("37812 mod256 = "+mod256(37812)); printbr("5 +1 = "+inc(5)); printbr("half of 894 is "+half(894)); var rand13=oper("r",13); do { printbr("49 ? 13 = "+rand13(49)); } while (rand13(13)!=1);