/* Whole CSS credits goes to Prashanth Kumar. */ alert("Enter the number till which, you want the result.\n\nEg: 5\nThe solution of all numbers from 0 to 5 will be printed.\n\nNote: Entering large number may crash the code."); function __(id){ return document.getElementById(id); } function isHappy(n){ var num = n; var sum = 0; // for steps var d = []; var row = []; var index = 0; var sumStep = []; while(n >= 0){ row.push(n % 10); sum += Math.pow(row[index], 2); n = Math.floor(n / 10); index++; if(n === 0){ sumStep.push(sum); d.push(row); row = []; index = 0; if(sum > 9){ n = sum; sum = 0; } else { break; } } } for(var i = 0; i < d.length; i++){ for(var j = d[i].length - 1; j >= 0; j--){ if(j > 0){ __("res").innerHTML += d[i][j] + "² + "; } else { __("res").innerHTML += d[i][j] + "² = "; } } __("res").innerHTML += sumStep[i] + "
"; } _s_ = (sum == 1) ? "a happy" : "an unhappy"; out = " is $ number.".replace("$", _s_); __("res").innerHTML += "
Thus, " + "" + num + "" + out + "

"; } function inRange(r){ navigator.vibrate(70); $("#res").slideUp(10); $("#res").slideDown(600); if(isNaN(r)){ __("res").innerHTML = "Enter a natural number only."; return; } __("res").innerHTML = ""; for(var i = 0; i <= r; i++){ isHappy(i); } }

[C8] Happy Numbers