InfiniteCalculator

InfiniteCalc.html

<script>

function multiply(a, b) {
  if (a == "") {
    a = "0";
  }
  if (b == "") {
    b = "0";
  }

  let x = a.toString().split("").reverse();
  let y = b.toString().split("").reverse();

  let carry = 0;
  let finalNumber = "";
  for (let i = 0; i < x.length; i++) {

    let number = "";
    for (let j = 0; j < y.length; j++) {
      let tempNumber = (Number.parseInt(x[i]) * Number.parseInt(y[j]) + carry).toString();
      if (tempNumber.length == 1) {
        number = tempNumber + number;
        carry = 0;
      } else if (tempNumber.length == 2) {
        number = tempNumber[1] + number;
        carry = Number.parseInt(tempNumber[0]);
      }
      tempNumber = "";
    }
    for (let p = 0; p < i; p++) {
      number = number + "0";
    }
    if (carry != 0) {
      number = carry.toString() + number;
    }
    carry = 0;
    finalNumber = add(number, finalNumber);
    number = "";
  }


  return finalNumber;
}

function add(a, b) {
  if (a == "") {
    a = "0";
  }
  if (b == "") {
    b = "0";
  }

  let x = a.toString().split("").reverse();
  let y = b.toString().split("").reverse();

  if (x.length <= y.length) {
    for (let i = x.length; i < y.length; i++) {
      x.push("0");
    }
  } else if (x.length > y.length) {
    for (let i = y.length; i < x.length; i++) {
      y.push("0");
    }
  }

  let number = "";
  let carry = 0;
  for (let i = 0; i < x.length; i++) {
    let tempNumber = (Number.parseInt(x[i]) + Number.parseInt(y[i]) + carry).toString();

    if (tempNumber.length == 1) {
      number = tempNumber + number;
      carry = 0;
    } else if (tempNumber.length == 2) {
      number = tempNumber[1] + number;
      carry = Number.parseInt(tempNumber[0]);
    }
    tempNumber = "";
  }
  if (carry != 0) {
    number = carry.toString() + number;
  }

  return number;
}

function power(x, n) {
  if (x == "") {
    x = "0";
  }
  if (n == "") {
    n = "0";
  }

  let number = "1";
  for (let i = 1; i <= Number.parseInt(n); i++) {
    number = multiply(x, number);
  }
  return number;

}


let a = prompt("x");
let b = prompt("n");
alert(power(a, b));

</script>