testCodeR/calculateInt.html at master · firsovdevelop/testCodeR · GitHub

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<html>
  <head>
    <title>Сложение больших чисел</title>
  </head>
  <body>
    <style>
      .input-block {
        margin: 10px;
      }
    </style>
    <script>

      var calculate = function() {
        var s1 = document.getElementById("int1").value;
        var s2 = document.getElementById("int2").value;
        var s = '';
        var n1, n2, n3, l1, l2, i;
        var c = '';

        l1 = s1.length;
        l2 = s2.length;

        if(l1 > l2) {
          s3 = s1;
          l3 = l1;

          s1 = s2;
          l1 = l2;

          s2 = s3;
          l2 = l3;
        }

        s3 = '';
        n3 = 0;

        for(i = l1; i >= 1; i--) {
          n1 = parseInt(s1.charAt(i-1));
          n2 = parseInt(s2.charAt(l2-1));
          l2 = l2 - 1;
          c = (n1 + n2 + n3) % 10;
          s3 = c + s3;
          if(n1 + n2 + n3 > 9) {
            n3 = 1
          }
          else {
            n3 = 0;
          }
        }


        while(n3 == 1) {
          if(l2 != 0) {
            n2 = parseInt(s2.charAt(l2 - 1));
            l2 = l2 - 1;
            c = (n2 + n3) % 10;
            s3 = c + s3;
            if((n2 + n3) < 10) {
              n3 = 0;
            }
          }
          else {
            s3 = '1' + s3;
            n3 = 0;
          }
        }

        if(l2 != 0) {
          s3 = s2.substring(0, l2) + s3;
        }

        console.log('Сумма чисел равна: ' + s3);
        alert('Сумма чисел равна: ' + s3);

      }
    </script>
    <div class="input-block">
      <span>Первое число</span><br>
      <input id="int1">
    </div>
    <div class="input-block">
      <span>Второе число</span><br>
      <input id="int2">
    </div>
    <div class="input-block">
      <button onclick="calculate()">Посчитать сумму</button>
    </div>
  </body>
</html>