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December 1, 2020 21:53
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Calculadora de números felices
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<html> | |
<head> | |
<title>Números felices</title> | |
</head> | |
<body> | |
<h1>Calculadora de números felices</h1> | |
<div> | |
<h2>Números felices en un rango</h2> | |
<p>Utiliza el siguiente formulario para calcular los números felices en un rango determinado</p> | |
<div> | |
<label for="start">Desde</label> | |
<input id="start" type="text" value="0" /> | |
</div> | |
<div> | |
<label for="end">Hasta</label> | |
<input id="end" type="text" value="100" /> | |
</div> | |
<div> | |
<label for="steps">Intentos</label> | |
<input id="steps" type="text" value="10" /> | |
</div> | |
<div> | |
<button onclick="calc()">Listar números felices</button> | |
</div> | |
<div> | |
<ul id="list"></ul> | |
</div> | |
</div> | |
<div> | |
<h2>¿Es feliz?</h2> | |
<p>Utiliza el siguiente formulario para comprobar si un número es feliz</p> | |
<div> | |
<label for="num">Número</label> | |
<input id="num" type="text" value="" /> | |
</div> | |
<div> | |
<label for="probes">Intentos</label> | |
<input id="probes" type="text" value="10" /> | |
</div> | |
<div> | |
<button onclick="probe()">Comprobar número</button> | |
</div> | |
<p id="result" role="status"></p> | |
</div> | |
<script> | |
var list = document.getElementById('list'); | |
var start = document.getElementById('start'); | |
var end = document.getElementById('end'); | |
var steps = document.getElementById('steps'); | |
var num = document.getElementById('num'); | |
var probes = document.getElementById('probes'); | |
var result = document.getElementById('result'); | |
num.addEventListener('keydown', function onEvent(e) { | |
if (e.key === "Enter") probe();; | |
}); | |
function isHappy(num, steps){ | |
var sums=[]; | |
var str=num.toString(); | |
for(step=0;step<steps;step++){ | |
var sum=0; | |
for (var char = 0, len = str.length; char < len; char++) { | |
var digit=parseInt(str.charAt(char)); | |
var sqr=Math.pow(digit, 2); | |
sum=sum+sqr; | |
} | |
if(sum==1)return true; | |
if(sums.includes(sum))return false; | |
sums.push(sum); | |
str=sum.toString(); | |
} | |
return false; | |
} | |
function happyOnRange(start, end, steps){ | |
var theyAreHappy=[]; | |
for(num=start;num<end;num++){ | |
if(isHappy(num, steps))theyAreHappy.push(num); | |
} | |
return theyAreHappy; | |
} | |
function calc(){ | |
list.innerHTML = ''; | |
var theyAreHappy=happyOnRange(parseInt(start.value), parseInt(end.value), parseInt(steps.value)); | |
theyAreHappy.forEach(function(happy){ | |
var item = document.createElement("li"); | |
item.appendChild(document.createTextNode('Número feliz '+happy)); | |
list.appendChild(item); | |
}); | |
} | |
function probe(){ | |
result.innerHTML = ''; | |
if(isHappy(parseInt(num.value), parseInt(probes.value))){ | |
result.appendChild(document.createTextNode('El '+parseInt(num.value)+' es un número feliz')); | |
}else{ | |
result.appendChild(document.createTextNode('El '+parseInt(num.value)+' no es un número feliz')); | |
} | |
} | |
</script> | |
</body> | |
</html> |
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