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Number System Conversion Calculator

Number System Converter
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How to Use:

  1. Select the Number System:

    • Choose the base number system you want to convert from using the first dropdown menu (from-select). Options include Binary, Decimal, Hexadecimal, and Octal.
  2. Select the Target Number System:

    • Choose the desired base number system you want to convert to using the second dropdown menu (to-select).
  3. Enter the Number:

    • Input the number you want to convert in the provided input field (from-input).
  4. Click Convert:

    • Press the “Convert” button (convert-button) to see the result in the designated output field (to-input).

Examples:

Example 1: Binary to Decimal
  • Convert the binary number “101010” to decimal.
    • Select “Binary” in the first dropdown and “Decimal” in the second dropdown.
    • Enter “101010” in the input field and click “Convert.” The result will be displayed in the output field.
Example 2: Decimal to Hexadecimal
  • Convert the decimal number “255” to hexadecimal.
    • Select “Decimal” in the first dropdown and “Hexadecimal” in the second dropdown.
    • Enter “255” in the input field and click “Convert.” The result will be displayed in the output field.
Example 3: Hexadecimal to Binary
  • Convert the hexadecimal number “1A3” to binary.
    • Select “Hexadecimal” in the first dropdown and “Binary” in the second dropdown.
    • Enter “1A3” in the input field and click “Convert.” The result will be displayed in the output field.

Notes:

  • Ensure that the input number matches the selected number system to avoid errors.
  • Invalid inputs will be indicated, and the output field will be cleared.
  • The tool supports conversions between Binary, Decimal, Hexadecimal, and Octal number systems.

Let’s integrate the HTML, CSS, and JavaScript code into a comprehensive content piece.

HTML:

				
					<!DOCTYPE html>
<html lang="en">

<head>
   <meta charset="UTF-8">
   <meta http-equiv="X-UA-Compatible" content="IE=edge">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>Number System Converter</title>

   
   
</head>

<body>
   <main>


      <div id="select-container">
         <select id="from-select">
            <option value="from-binary">Binary</option>
            <option value="from-decimal">Decimal</option>
            <option value="from-hexadecimal">Hexadecimal</option>
            <option value="from-octal">Octal</option>
         </select>
         <span>to</span>
         <select id="to-select">
            <option value="to-binary">Binary</option>
            <option value="to-decimal">Decimal</option>
            <option value="to-hexadecimal">Hexadecimal</option>
            <option value="to-octal">Octal</option>
         </select>
      </div>

      <div id="input-container">
         <input type="text" id="from-input" placeholder="Binary Number">
         <span id="error"></span>
      </div>

      <button id="convert-button">Convert</button>

      <input type="text" id="to-input" placeholder="Binary Number" readonly>
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</html>

				
			

CSS:

				
					
				
			

JAVASCRIPT:

				
					    const fromSelected = document.getElementById("from-select");
    const toSelected = document.getElementById("to-select");
    const from = document.getElementById("from-input");
    const to = document.getElementById("to-input");
    const error = document.getElementById("error");
    
    let fromNS = "Binary", toNS = "Binary";
    
    fromSelected.addEventListener("change", function () {
       fromNS = fromSelected.options[fromSelected.selectedIndex].text;
       from.placeholder = fromNS + " Number";
    });
    
    toSelected.addEventListener("change", function () {
       toNS = toSelected.options[toSelected.selectedIndex].text;
       to.placeholder = toNS + " Number";
    });
    
    from.addEventListener("input", function () {
       error.style.display = "none";
    });
    
    let fromValue;
    document.getElementById("convert-button").addEventListener("click", function () {
       switch (fromNS) {
          case "Binary":
             fromValue = from.value;
             if (/^[01]*$/.test(fromValue)) {
                switch (toNS) {
                   case "Decimal": to.value = parseInt(fromValue, 2);
                      break;
                   case "Hexadecimal": to.value = parseInt(fromValue, 2).toString(16).toUpperCase();
                      break;
                   case "Octal": to.value = parseInt(fromValue, 2).toString(8);
                      break;
                   default: to.value = fromValue;
                }
             } else {
                error.style.display = "inherit";
                error.innerText = "Invalid " + fromNS + " Number";
                to.value = "";
             }
             break;
    
          case "Decimal":
             fromValue = from.value;
             if (/^[0-9]*$/.test(fromValue)) {
                switch (toNS) {
                   case "Binary": to.value = Math.abs(fromValue).toString(2);
                      break;
                   case "Hexadecimal": to.value = Math.abs(fromValue).toString(16).toUpperCase();
                      break;
                   case "Octal": to.value = Math.abs(fromValue).toString(8);
                      break;
                   default: to.value = fromValue;
                }
             } else {
                error.style.display = "inherit";
                error.innerText = "Invalid " + fromNS + " Number";
                to.value = "";
             }
             break;
    
          case "Hexadecimal":
             fromValue = from.value;
             if (/^[0-9a-fA-F]*$/.test(fromValue)) {
                switch (toNS) {
                   case "Binary": to.value = parseInt(fromValue, 16).toString(2);
                      break;
                   case "Decimal": to.value = parseInt(fromValue, 16);
                      break;
                   case "Octal": to.value = parseInt(fromValue, 16).toString(8);
                      break;
                   default: to.value = fromValue;
                }
             } else {
                error.style.display = "inherit";
                error.innerText = "Invalid " + fromNS + " Number";
                to.value = "";
             }
             break;
    
          case "Octal":
             fromValue = from.value;
             if (/^[0-7]*$/.test(fromValue)) {
                switch (toNS) {
                   case "Binary": to.value = parseInt(fromValue, 8).toString(2);
                      break;
                   case "Decimal": to.value = parseInt(fromValue, 8);
                      break;
                   case "Hexadecimal": to.value = parseInt(fromValue, 8).toString(16).toUpperCase();
                      break;
                   default: to.value = fromValue;
                }
             } else {
                error.style.display = "inherit";
                error.innerText = "Invalid " + fromNS + " Number";
                to.value = "";
             }
             break;
       }
    });
    
				
			

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