const exp = document.getElementById("exp"); const btn = document.getElementById("btn"); const out = document.getElementById("out"); function xpabc(a, b, c) { return eval(exp.value); } btn.onclick = function() { out.innerHTML = (((((((((xpabc(0,0,0) << 1) | xpabc(0,0,1)) << 1) | xpabc(0,1,0)) << 1) | xpabc(0,1,1)) << 1) | xpabc(1,0,0)) << 1) | xpabc(1,0,1)) << 1) | xpabc(1,1,0)) << 1) | xpabc(1,1,1); }