pi.js

#!/usr/local/bin/node

var minErr = 4;

for (var i = 1; i < 100000000; i++) {

    var j = Math.floor(Math.PI * i);
    var err = Math.abs(Math.PI - (j/i));
    var err1 = Math.abs(Math.PI - ((j+1)/i));

    if (err > err1) {
        err = err1;
        j = j+1;
    }

    if (minErr > err) {
        minErr = err;
        console.log("" + j + "/" + i + " = " + (j / i) + ", ERR=" + err);
        if (err == 0) break;
    }
}

console.log("DONE with i=" + i);