22 - python & all web labs

labWeb/lab9/script.js

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+
+
+function calculateGCD(a, b) {
+    a = Math.abs(a);
+    b = Math.abs(b);
+    
+    while (b !== 0) {
+        let temp = b;
+        b = a % b;
+        a = temp;
+    }
+    return a;
+}
+
+
+
+function reduceFraction(numerator, denominator) {
+    
+    if (denominator === 0) {
+        return { error: "Знаменатель не может быть нулем!" };
+    }
+    
+    
+    if (numerator === 0) {
+        return { numerator: 0, denominator: 1 };
+    }
+    
+    
+    const gcd = calculateGCD(numerator, denominator);
+    
+    
+    let newNum = numerator / gcd;
+    let newDen = denominator / gcd;
+    
+    
+    if (newDen < 0) {
+        newNum = -newNum;
+        newDen = -newDen;
+    }
+    
+    return { numerator: newNum, denominator: newDen };
+}
+
+
+
+function addFractions(num1, den1, num2, den2) {
+    
+    const resultNum = num1 * den2 + num2 * den1;
+    const resultDen = den1 * den2;
+    return reduceFraction(resultNum, resultDen);
+}
+
+
+
+function subtractFractions(num1, den1, num2, den2) {
+    
+    const resultNum = num1 * den2 - num2 * den1;
+    const resultDen = den1 * den2;
+    return reduceFraction(resultNum, resultDen);
+}
+
+
+
+function multiplyFractions(num1, den1, num2, den2) {
+    
+    const resultNum = num1 * num2;
+    const resultDen = den1 * den2;
+    return reduceFraction(resultNum, resultDen);
+}
+
+
+
+function divideFractions(num1, den1, num2, den2) {
+    
+    
+    if (num2 === 0) {
+        return { error: "Нельзя делить на ноль!" };
+    }
+    const resultNum = num1 * den2;
+    const resultDen = den1 * num2;
+    return reduceFraction(resultNum, resultDen);
+}
+
+
+
+function displayResult(result) {
+    const resultDisplay = document.getElementById('result-display');
+    const resultNum = document.getElementById('result-num');
+    const resultDen = document.getElementById('result-den');
+    const resultText = document.getElementById('result-text');
+    const errorMessage = document.getElementById('error-message');
+    const placeholder = document.getElementById('placeholder-text');
+    
+    
+    resultDisplay.classList.add('hidden');
+    resultText.classList.add('hidden');
+    errorMessage.classList.add('hidden');
+    placeholder.classList.add('hidden');
+    
+    
+    if (result.error) {
+        errorMessage.textContent = result.error;
+        errorMessage.classList.remove('hidden');
+        return;
+    }
+    
+    
+    resultNum.textContent = result.numerator;
+    resultDen.textContent = result.denominator;
+    resultDisplay.classList.remove('hidden');
+    
+    
+    resultText.textContent = `Ответ: ${result.numerator}/${result.denominator}`;
+    resultText.classList.remove('hidden');
+}
+
+
+
+function getInputValues() {
+    const num1 = parseInt(document.getElementById('num1').value) || 0;
+    const den1 = parseInt(document.getElementById('den1').value) || 1;
+    const num2 = parseInt(document.getElementById('num2').value) || 0;
+    const den2 = parseInt(document.getElementById('den2').value) || 1;
+    
+    
+    if (den1 === 0 || den2 === 0) {
+        return { error: "Знаменатель дроби не может быть равен нулю!" };
+    }
+    
+    return { num1, den1, num2, den2 };
+}
+
+
+
+function performOperation(operation) {
+    
+    const inputs = getInputValues();
+    
+    
+    if (inputs.error) {
+        displayResult({ error: inputs.error });
+        return;
+    }
+    
+    let result;
+    
+    
+    switch(operation) {
+        case 'add':
+            result = addFractions(inputs.num1, inputs.den1, inputs.num2, inputs.den2);
+            break;
+        case 'subtract':
+            result = subtractFractions(inputs.num1, inputs.den1, inputs.num2, inputs.den2);
+            break;
+        case 'multiply':
+            result = multiplyFractions(inputs.num1, inputs.den1, inputs.num2, inputs.den2);
+            break;
+        case 'divide':
+            result = divideFractions(inputs.num1, inputs.den1, inputs.num2, inputs.den2);
+            break;
+        default:
+            result = { error: "Неизвестная операция" };
+    }
+    
+    
+    displayResult(result);
+}
+
+
+document.addEventListener('DOMContentLoaded', function() {
+    const inputs = document.querySelectorAll('.fraction-input');
+    inputs.forEach(input => {
+        input.addEventListener('keypress', function(e) {
+            if (e.key === 'Enter') {
+                
+                performOperation('add');
+            }
+        });
+    });
+});