Psico/calc.html at main · ivansouza/Psico · GitHub

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<!DOCTYPE html>
<html lang="pt-BR">
<head>
<meta charset="UTF-8">
<title>Calculadora Científica</title>
<style>
  body {font-family: Arial, sans-serif; background:#f0f4f8; display:flex; justify-content:center; padding:20px;}
  #calc {background:#fff; border-radius:12px; padding:20px; box-shadow:0 4px 12px rgba(0,0,0,.1); width:340px;}
  #display {background:#e9ecef; color:#212529; font-size:2rem; text-align:right; padding:10px; border-radius:8px; margin-bottom:15px; height:50px; line-height:50px;}
  .keys {display:grid; grid-template-columns:repeat(4,1fr); gap:10px;}
  button {padding:15px; font-size:1.1rem; border:none; border-radius:6px; cursor:pointer; background:#28a745; color:#fff;}
  button.operator {background:#007bff;}
  button.scientific {background:#6c757d;}
  button.memory {background:#fd7e14;}
  button.Clear {background:#dc3545;}
  button.Func {font-size:.9rem;}
</style>
</head>
<body>
<div id="calc">
  <div id="display">0</div>
  <div class="keys">
    <button class="Clear">C</button>
    <button class="Clear">←</button>
    <button class="operator" data-op="/">÷</button>
    <button class="operator" data-op="*">×</button>

    <button data-func="sin">sin</button>
    <button data-func="cos">cos</button>
    <button data-func="tan">tan</button>
    <button data-func="log">log</button>

    <button data-func="sqrt">√</button>
    <button data-func="pi">π</button>
    <button data-func="e">e</button>
    <button data-func="^">xʸ</button>

    <button class="memory">M+</button>
    <button class="memory">M-</button>
    <button class="memory">MR</button>
    <button class="memory">MC</button>

    <button data-num="7">7</button>
    <button data-num="8">8</button>
    <button data-num="9">9</button>
    <button class="operator" data-op="-">‑</button>

    <button data-num="4">4</button>
    <button data-num="5">5</button>
    <button data-num="6">6</button>
    <button class="operator" data-op="+">+</button>

    <button data-num="1">1</button>
    <button data-num="2">2</button>
    <button data-num="3">3</button>
    <button data-func="%">%</button>

    <button data-num="0" style="grid-column: span 2;">0</button>
    <button data-dot=".">.</button>
    <button class="operator" data-eq="=">=</button>
  </div>
</div>

<script>
  // Exemplo de expressão matemática: $ \pi \approx 3.14159 $
  const display = document.getElementById('display');
  let current = '';          // O que está sendo digitado
  let previous = '';         // Valor anterior (para operaçães)
  let operator = null;       // Operador escolhido
  let resetDisplay = false;  // Controla se devemos limpar o display
  const memory = { value: 0 };

  // Atualiza o texto do display
  const updateDisplay = () => {
    display.textContent = current || '0';
  };

  // Funções matemáticas (usam Math)
  const functions = {
    sin: x => Math.sin(degToRad(x)),
    cos: x => Math.cos(degToRad(x)),
    tan: x => Math.tan(degToRad(x)),
    sqrt: x => Math.sqrt(x),
    log: x => Math.log10(x),
    ln: x => Math.log(x),
    pi: () => Math.PI,
    e: () => Math.E,
    '^': (base, exp) => Math.pow(base, exp)
  };

  // Converte graus para radianos
  const degToRad = deg => deg * Math.PI / 180;

  // Manipula cliques ou teclas
  document.querySelector('.keys').addEventListener('click', e => {
    const btn = e.target;
    if (!btn) return;

    const tag = btn.dataset;

    // Números e ponto
    if (tag.num !== undefined) {
      if (resetDisplay) { current = ''; resetDisplay = false; }
      current = current === '0' ? tag.num : current + tag.num;
    } else if (tag.dot !== undefined) {
      if (resetDisplay) { current = ''; resetDisplay = false; }
      if (!current.includes('.')) current += '.';
    }

    // Operações
    else if (tag.op) {
      if (operator && !resetDisplay) evaluate();
      else previous = current;
      operator = tag.op;
      resetDisplay = true;
    }

    // Funções científicas
    else if (tag.func) {
      if (tag.func === 'sin' || tag.func === 'cos' || tag.func === 'tan') {
        current = functions[tag.func](parseFloat(current)).toString();
      } else if (tag.func === 'sqrt') {
        current = functions.sqrt(parseFloat(current)).toString();
      } else if (tag.func === 'log' || tag.func === 'ln') {
        current = functions[tag.func](parseFloat(current)).toString();
      } else {
        current = functions[tag.func]().toString();
      }
      updateDisplay();
      resetDisplay = true;
    }

    // Memória
    else if (tag.memory) {
      switch (tag.memory) {
        case 'M+': memory.value += parseFloat(current); break;
        case 'M-': memory.value -= parseFloat(current); break;
        case 'MR': current = memory.value.toString(); updateDisplay(); resetDisplay = true; break;
        case 'MC': memory.value = 0; break;
      }
      updateDisplay();
    }

    // Igualdade
    else if (tag.eq) {
      if (operator) evaluate();
      updateDisplay();
    }

    // Limpeza
    else if (btn.textContent === 'C') { current = ''; operator = null; resetDisplay = false; updateDisplay(); }
    else if (btn.textContent === '←') { current = current.slice(0, -1) || '0'; updateDisplay(); }

    // Atualiza display a qualquer mudança
    updateDisplay();
  });

  // Avalia expressões matemáticas simples
  const evaluate = () => {
    const curr = parseFloat(current);
    const prev = parseFloat(previous);
    let result;

    switch (operator) {
      case '+': result = prev + curr; break;
      case '-': result = prev - curr; break;
      case '×': result = prev * curr; break;
      case '÷': result = curr !== 0 ? prev / curr : NaN; break;
      case '^': result = Math.pow(prev, curr); break;
      default: return;
    }
    current = result.toString();
    operator = null;
    previous = '';
    resetDisplay = true;
  };

  // Suporte ao teclado físico
  document.addEventListener('keydown', e => {
    const key = e.key;
    const btn = document.querySelector(`button[data-num="${key}"],
                                          button[data-op="${key}"],
                                          button[data-func="${key}"],
                                          button[data-dot="${key}"],
                                          button[data-eq="${key}"]`);
    if (btn) btn.click();
  });
</script>
</body>
</html>