Decimal-Binary (JavaScript) Project

Question

Basically a decimal-binary conversion. Code follows:

function convert() {
  var val = $("txtIn").value;
  if (val ===""){
    alert("No value entered for converstion.");
    return;
  }
  var cT = document.getElementsByName("tType");
  if (cT[0].checked) {
    //to Binary
    var dval = parseInt(val);
    if (isNaN(dval)) {
      alert("Input value is not a number!");
    } else if ((val % 1) !==0) {
      alert("Input value cannot include fraction or decimal");
    } else if (dval < 0) {
      alert("Input value must be a positive value.");
    } else {
      convertByArray(dval);
    }

  } ***else if (cT[1].checked)*** {
    //to decimal
    var bval = parseInt(val,2);
    if (isNaN(bval)) {
      alert("Input value is not a number!");
    } else if ((val % 1) !==0) {
      alert("Input value cannot include fraction or decimal");
    } else if (bval === 0 || dval === 1) {
      alert("Input value can only be 1s and 0s.");
    } else {
      convertByArray(dval);
    }
    //validity check, only 1s and 0s permitted, acknowledge spaces, cannot
    //be negative
  } else {
    alert("Please select a conversion type.");
  }
}

cT[1] (binary to decimal) is the section that's giving me trouble. When I run it in Firefox, it does return the input, just not the desired binary-to-decimal. Not sure what I'm doing wrong.

The dval variable has its own converter function, so figured declare a bval and give its own as follows, but still not the desired output. No idea what I'm doing wrong:

function convertByArray(dval) {
  var rA = new Array();
  var r,i,j;

  i=0;
  while (dval > 0) {
    r = dval % 2; //remainder
    rA[i] =r;
    var nV = (dval - r) / 2;
    $("txtCalc").value = $("txtCalc").value +
      "Decimal " + dval + " divided by 2 = " + nV +
      " w/ Remainder of: " + r +"\n";
    i += 1;
    dval = nV;
  }
  for(j=rA.length-1; j>=0; j--) {
    $("txtOut").value = $("txtOut").value + rA[j];
  }
}

Community · Accepted Answer · 2020-06-20 09:12:55Z

1

Can't really follow all of that. If you are looking just to convert bin to dec, all it takes is one method parseInt(num, radix).

Demo

This demo can convert decimal, binary, and hexadecimal

const convert = (rxFrom, rxTo, number) => parseInt(number, rxFrom).toString(rxTo);

let bin1 = 1101001;
let bin2 = 10100001;
let dec1 = 5641;
let dec2 = 97;
let hex1 = `ff96ca`;
let hex2 = `25dc5b`;
const bin2dec = convert(2, 10, bin1);
const bin2hex = convert(2, 16, bin2);
const dec2bin = convert(10, 2, dec1);
const dec2hex = convert(10, 16, dec2);
const hex2dec = convert(16, 10, hex1);
const hex2bin = convert(16, 2, hex2);

console.log(bin2dec);
console.log(bin2hex);
console.log(dec2bin);
console.log(dec2hex);
console.log(hex2dec);
console.log(hex2bin);

edited Jun 20, 2020 at 9:12

CommunityBot

11 silver badge

answered Mar 13, 2019 at 3:25

zer00ne

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