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Add the validation for 0 and '+' operator #1179

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Add the validation for 0 and '+' operator #1179

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35 changes: 35 additions & 0 deletions Calculator/yash_pokharna/index.html
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Original file line number Diff line number Diff line change
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Calculator</title>
<link rel="stylesheet" href="styles.css">
</head>
<body>
<div class="calculator">
<input type="text" id="display" readonly>
<div class="buttons">
<button onclick="clearDisplay()">C</button>
<button onclick="addOperator('/')">/</button>
<button onclick="addOperator('*')">*</button>
<button onclick="deleteLast()">DEL</button><br>
<button onclick="appendNumber('7')">7</button>
<button onclick="appendNumber('8')">8</button>
<button onclick="appendNumber('9')">9</button>
<button onclick="addOperator('-')">-</button><br>
<button onclick="appendNumber('4')">4</button>
<button onclick="appendNumber('5')">5</button>
<button onclick="appendNumber('6')">6</button>
<button onclick="addOperator('+')">+</button><br>
<button onclick="appendNumber('1')">1</button>
<button onclick="appendNumber('2')">2</button>
<button onclick="appendNumber('3')">3</button>
<button onclick="calculate()">=</button><br>
<button onclick="appendNumber('0')">0</button>
<button onclick="appendNumber('.')">.</button>
</div>
</div>
<script src="script.js"></script>
</body>
</html>
38 changes: 38 additions & 0 deletions Calculator/yash_pokharna/script.js
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let display = document.getElementById("display");

function clearDisplay() {
display.value = "";
}

function deleteLast() {
display.value = display.value.slice(0, -1);
}

function appendNumber(number) {
if (number === '.' && display.value.includes('.') && !isNaN(display.value.slice(-1))) {
alert("Error: Multiple decimal points are not allowed.");
return;
}
display.value += number;
}

function addOperator(operator) {
const lastChar = display.value.slice(-1);
if (!display.value || isNaN(lastChar)) {
alert("Error: Cannot add consecutive operators.");
return;
}
display.value += operator;
}

function calculate() {
try {
if (display.value.includes("/0")) {
alert("Error: Division by zero is undefined.");
return;
}
display.value = eval(display.value);
} catch (error) {
alert("Error: Invalid operation.");
}
}
52 changes: 52 additions & 0 deletions Calculator/yash_pokharna/style.css
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body {
font-family: Arial, sans-serif;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
margin: 0;
background-color: #f5f5f5;
}

.calculator {
background: #fff;
padding: 20px;
border-radius: 10px;
box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

#display {
width: 100%;
height: 50px;
font-size: 18px;
margin-bottom: 10px;
text-align: right;
padding: 5px;
border: 1px solid #ccc;
border-radius: 5px;
background: #f9f9f9;
}

.buttons {
display: grid;
grid-template-columns: repeat(4, 1fr);
gap: 10px;
}

button {
height: 50px;
font-size: 18px;
border: none;
border-radius: 5px;
cursor: pointer;
background: #007BFF;
color: white;
}

button:hover {
background: #0056b3;
}

button:active {
background: #003f7f;
}