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91 lines
2.4 KiB
91 lines
2.4 KiB
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>Simple Calculator</title>
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<style>
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body {
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font-family: Arial, sans-serif;
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display: flex;
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justify-content: center;
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align-items: center;
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height: 100vh;
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margin: 0;
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}
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.calculator {
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border: 1px solid #ccc;
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padding: 20px;
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box-shadow: 0 0 10px #ccc;
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}
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input[type="text"] {
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width: 220px;
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padding: 10px;
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margin-bottom: 10px;
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}
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button {
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padding: 10px 20px;
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margin-right: 5px;
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cursor: pointer;
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}
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</style>
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</head>
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<body>
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<div class="calculator">
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<input type="text" id="firstNumber" placeholder="输入第一个数" />
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<input type="text" id="secondNumber" placeholder="输入第二个数" />
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<button onclick="calculate('+')">+</button>
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<button onclick="calculate('-')">-</button>
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<button onclick="calculate('*')">*</button>
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<button onclick="calculate('/')">/</button>
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<button onclick="calculate('%')">%</button>
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<div id="result">结果:</div>
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</div>
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<script>
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function calculate(operator) {
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var firstNumber = parseFloat(
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document.getElementById("firstNumber").value
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);
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var secondNumber = parseFloat(
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document.getElementById("secondNumber").value
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);
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var result;
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switch (operator) {
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case "+":
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result = firstNumber + secondNumber;
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break;
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case "-":
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result = firstNumber - secondNumber;
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break;
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case "*":
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result = firstNumber * secondNumber;
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break;
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case "/":
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if (secondNumber !== 0) {
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result = firstNumber / secondNumber;
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} else {
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alert("Cannot divide by zero.");
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return;
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}
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break;
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case "%":
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if (secondNumber !== 0) {
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result = firstNumber % secondNumber;
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} else {
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alert("Cannot calculate modulo by zero.");
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return;
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}
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break;
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default:
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alert("Unsupported operation.");
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return;
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}
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document.getElementById("result").textContent = "Result: " + result;
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}
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</script>
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</body>
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</html>
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