diff --git a/Calculator/AdyaTech/README.md b/Calculator/AdyaTech/README.md
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+# Calculator App
+
+A simple interactive **Calculator App** built using **HTML, CSS and JavaScript**.
+
+---
+
+### ✅ Input Validation & Error Handling Improvements
+
+### 1. Division by Zero Handling
+- Added explicit checks to prevent division by zero.
+- When a division by zero is detected, the calculator displays **"Error"** instead of returning `Infinity`.
+- The calculator safely stops further calculation until cleared.
+
+---
+
+### 2. Prevention of Consecutive Operators
+- Restricted users from entering multiple operators consecutively (e.g. `5 ++ 3`).
+- If an operator is entered after another operator, the previous operator is automatically replaced.
+- Ensures valid mathematical expressions at all times.
+
+---
+
+### 3. Decimal Point Validation
+- Prevented multiple decimal points within a single number (e.g. `3.1.4`).
+- The calculator now checks the current number segment before allowing a decimal.
+- Eliminates parsing and calculation errors.
+
+---
+
+### ⌨️ Keyboard Support Added
+
+The calculator now supports full keyboard input:
+
+- **Numbers:** `0–9`
+- **Operators:** `+ - * /`
+- **Decimal:** `.`
+- **Enter / =** → Calculate result
+- **Backspace** → Delete last character
+- **Escape (Esc)** → Clear input
+
+Keyboard operators `*` and `/` are internally mapped to `×` and `÷`.
+
+---
+
+
diff --git a/Calculator/AdyaTech/index.html b/Calculator/AdyaTech/index.html
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+++ b/Calculator/AdyaTech/index.html
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+
+
+
+ Calculator
+
+
+
+
+
+
\ No newline at end of file
diff --git a/Calculator/AdyaTech/script.js b/Calculator/AdyaTech/script.js
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+++ b/Calculator/AdyaTech/script.js
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+"use strict";
+
+var input = document.getElementById("input"),
+ number = document.querySelectorAll(".numbers div"),
+ operator = document.querySelectorAll(".operators div"),
+ result = document.getElementById("result"),
+ clear = document.getElementById("clear"),
+ resultDisplayed = false;
+
+// =====================
+// Helper Functions
+// =====================
+function isOperator(char) {
+ return char === "+" || char === "-" || char === "×" || char === "÷";
+}
+
+function backspace() {
+ if (resultDisplayed) {
+ input.innerHTML = "";
+ resultDisplayed = false;
+ } else {
+ input.innerHTML = input.innerHTML.slice(0, -1);
+ }
+}
+
+function addValue(value) {
+ var currentString = input.innerHTML;
+ var lastChar = currentString[currentString.length - 1];
+
+ // Prevent multiple decimals in one number
+ if (value === ".") {
+ var parts = currentString.split(/\+|\-|\×|\÷/);
+ if (parts[parts.length - 1].includes(".")) return;
+ }
+
+ if (!resultDisplayed) {
+ input.innerHTML += value;
+ } else if (resultDisplayed && isOperator(lastChar)) {
+ resultDisplayed = false;
+ input.innerHTML += value;
+ } else {
+ resultDisplayed = false;
+ input.innerHTML = value;
+ }
+}
+
+// =====================
+// Number Buttons
+// =====================
+for (var i = 0; i < number.length; i++) {
+ number[i].addEventListener("click", function (e) {
+ addValue(e.target.innerHTML);
+ });
+}
+
+// =====================
+// Operator Buttons
+// =====================
+for (var i = 0; i < operator.length; i++) {
+ operator[i].addEventListener("click", function (e) {
+ var currentString = input.innerHTML;
+ var lastChar = currentString[currentString.length - 1];
+
+ if (currentString.length === 0) return;
+
+ if (isOperator(lastChar)) {
+ input.innerHTML =
+ currentString.substring(0, currentString.length - 1) +
+ e.target.innerHTML;
+ } else {
+ input.innerHTML += e.target.innerHTML;
+ }
+ });
+}
+
+// =====================
+// Equal Button
+// =====================
+result.addEventListener("click", calculate);
+
+function calculate() {
+ var inputString = input.innerHTML;
+ if (inputString.length === 0) return;
+
+ var numbers = inputString.split(/\+|\-|\×|\÷/g);
+ var operators = inputString.replace(/[0-9]|\./g, "").split("");
+
+ // Division
+ var divide = operators.indexOf("÷");
+ while (divide !== -1) {
+ if (numbers[divide + 1] == 0) {
+ input.innerHTML = "Error";
+ resultDisplayed = true;
+ return;
+ }
+ numbers.splice(divide, 2, numbers[divide] / numbers[divide + 1]);
+ operators.splice(divide, 1);
+ divide = operators.indexOf("÷");
+ }
+
+ // Multiplication
+ var multiply = operators.indexOf("×");
+ while (multiply !== -1) {
+ numbers.splice(multiply, 2, numbers[multiply] * numbers[multiply + 1]);
+ operators.splice(multiply, 1);
+ multiply = operators.indexOf("×");
+ }
+
+ // Subtraction
+ var subtract = operators.indexOf("-");
+ while (subtract !== -1) {
+ numbers.splice(subtract, 2, numbers[subtract] - numbers[subtract + 1]);
+ operators.splice(subtract, 1);
+ subtract = operators.indexOf("-");
+ }
+
+ // Addition
+ var add = operators.indexOf("+");
+ while (add !== -1) {
+ numbers.splice(
+ add,
+ 2,
+ parseFloat(numbers[add]) + parseFloat(numbers[add + 1])
+ );
+ operators.splice(add, 1);
+ add = operators.indexOf("+");
+ }
+
+ input.innerHTML = numbers[0];
+ resultDisplayed = true;
+}
+
+// =====================
+// Clear Button
+// =====================
+clear.addEventListener("click", function () {
+ input.innerHTML = "";
+ resultDisplayed = false;
+});
+
+// =====================
+// Keyboard Support
+// =====================
+document.addEventListener("keydown", function (e) {
+ if (e.key >= "0" && e.key <= "9") {
+ addValue(e.key);
+ }
+
+ if (e.key === ".") {
+ addValue(".");
+ }
+
+ if (e.key === "+" || e.key === "-") {
+ addValue(e.key);
+ }
+
+ if (e.key === "*") {
+ addValue("×");
+ }
+
+ if (e.key === "/") {
+ addValue("÷");
+ }
+
+ if (e.key === "Enter" || e.key === "=") {
+ e.preventDefault();
+ calculate();
+ }
+
+ if (e.key === "Backspace") {
+ backspace();
+ }
+
+ if (e.key === "Escape") {
+ input.innerHTML = "";
+ resultDisplayed = false;
+ }
+});
diff --git a/Calculator/AdyaTech/style.css b/Calculator/AdyaTech/style.css
new file mode 100644
index 000000000..77f3c2920
--- /dev/null
+++ b/Calculator/AdyaTech/style.css
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+body {
+ width: 500px;
+ margin: 4% auto;
+ font-family: 'Source Sans Pro', sans-serif;
+ letter-spacing: 5px;
+ font-size: 1.8rem;
+ -moz-user-select: none;
+ -webkit-user-select: none;
+ -ms-user-select: none;
+}
+
+.calculator {
+ height: 500px;
+ padding: 20px;
+ -webkit-box-shadow: 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
+ box-shadow: 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
+ border-radius: 1px;
+}
+
+.input {
+ border: 1px solid #ddd;
+ border-radius: 1px;
+ height: 60px;
+ padding-right: 15px;
+ padding-top: 10px;
+ text-align: right;
+ margin-right: 6px;
+ font-size: 2.5rem;
+ overflow-x: auto;
+ transition: all .2s ease-in-out;
+}
+
+.input:hover {
+ border: 1px solid #bbb;
+ -webkit-box-shadow: inset 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
+ box-shadow: inset 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
+}
+
+.buttons {}
+
+.operators {}
+
+.operators div {
+ display: inline-block;
+ border: 1px solid #bbb;
+ border-radius: 1px;
+ width: 80px;
+ text-align: center;
+ padding: 10px;
+ margin: 20px 4px 10px 0;
+ cursor: pointer;
+ background-color: #ddd;
+ transition: border-color .2s ease-in-out, background-color .2s, box-shadow .2s;
+}
+
+.operators div:hover {
+ background-color: #ddd;
+ -webkit-box-shadow: 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
+ box-shadow: 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
+ border-color: #aaa;
+}
+
+.operators div:active {
+ font-weight: bold;
+}
+
+.leftPanel {
+ display: inline-block;
+}
+
+.numbers div {
+ display: inline-block;
+ border: 1px solid #ddd;
+ border-radius: 1px;
+ width: 80px;
+ text-align: center;
+ padding: 10px;
+ margin: 10px 4px 10px 0;
+ cursor: pointer;
+ background-color: #f9f9f9;
+ transition: border-color .2s ease-in-out, background-color .2s, box-shadow .2s;
+}
+
+.numbers div:hover {
+ background-color: #f1f1f1;
+ -webkit-box-shadow: 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
+ box-shadow: 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
+ border-color: #bbb;
+}
+
+.numbers div:active {
+ font-weight: bold;
+}
+
+div.equal {
+ display: inline-block;
+ border: 1px solid #3079ED;
+ border-radius: 1px;
+ width: 17%;
+ text-align: center;
+ padding: 127px 10px;
+ margin: 10px 6px 10px 0;
+ vertical-align: top;
+ cursor: pointer;
+ color: #FFF;
+ background-color: #4d90fe;
+ transition: all .2s ease-in-out;
+ position: relative;
+ left: 358px;
+ bottom: 300px;
+}
+
+div.equal:hover {
+ background-color: #307CF9;
+ -webkit-box-shadow: 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
+ box-shadow: 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
+ border-color: #1857BB;
+}
+
+div.equal:active {
+ font-weight: bold;
+}
+