`; printWindow.document.write(printContent); printWindow.document.close(); printWindow.focus(); printWindow.print(); printWindow.close(); } // Clear history function clearHistory() { if (calculationHistory.length === 0) { alert('History is already empty.'); return; } if (confirm('Are you sure you want to clear all calculation history?')) { calculationHistory = []; stats = { total: 0, simple: 0, scientific: 0, percentage: 0 }; updateHistoryDisplay(); updateStatsDisplay(); saveHistoryToStorage(); } } // Save history to localStorage function saveHistoryToStorage() { try { const historyToSave = calculationHistory.slice(0, 100); // Limit to 100 items localStorage.setItem('calculatorHistory', JSON.stringify(historyToSave)); localStorage.setItem('calculatorStats', JSON.stringify(stats)); } catch (e) { console.error('Failed to save history to localStorage:', e); } } // Load history from localStorage function loadHistoryFromStorage() { try { const savedHistory = localStorage.getItem('calculatorHistory'); const savedStats = localStorage.getItem('calculatorStats'); if (savedHistory) { calculationHistory = JSON.parse(savedHistory); updateHistoryDisplay(); } if (savedStats) { stats = JSON.parse(savedStats); updateStatsDisplay(); } } catch (e) { console.error('Failed to load history from localStorage:', e); } } // Get operation symbol for display function getOperationSymbol(op) { switch(op) { case '+': return '+'; case '-': return '−'; case '*': return '×'; case '/': return '÷'; case 'pow': return '^'; case 'exp': return 'EXP'; case 'mod': return 'mod'; default: return op; } } // Factorial function function factorial(n) { if (n < 0) throw new Error("Factorial of negative number"); if (n === 0 || n === 1) return 1; let result = 1; for (let i = 2; i <= n; i++) { result *= i; } return result; } // Switch between calculator types function switchCalculator(type) { currentCalculator = type; // Hide all calculators simpleCalculator.style.display = 'none'; scientificCalculator.style.display = 'none'; percentageCalculator.style.display = 'none'; // Show selected calculator if (type === 'simple') { simpleCalculator.style.display = 'grid'; calculatorTypeElement.textContent = 'Simple Calculator'; } else if (type === 'scientific') { scientificCalculator.style.display = 'grid'; calculatorTypeElement.textContent = 'Scientific Calculator'; } else if (type === 'percentage') { percentageCalculator.style.display = 'grid'; calculatorTypeElement.textContent = 'Percentage Calculator'; } // Reset calculator currentValue = '0'; previousValue = ''; operation = null; calculationDisplay = '0'; isPercentageMode = false; updateDisplay(); } // Update display function updateDisplay() { resultElement.textContent = currentValue; calculationElement.textContent = calculationDisplay; } // Handle keyboard input function handleKeyboardInput(event) { const key = event.key; // Numbers if (key >= '0' && key <= '9') { inputNumber(key); } // Decimal point else if (key === '.') { handleAction('.'); } // Operations else if (key === '+') { handleAction('+'); } else if (key === '-') { handleAction('-'); } else if (key === '*') { handleAction('*'); } else if (key === '/') { event.preventDefault(); handleAction('/'); } // Equals or Enter else if (key === '=' || key === 'Enter') { handleAction('='); } // Escape for clear else if (key === 'Escape') { handleAction('clear'); } // Backspace else if (key === 'Backspace') { handleAction('backspace'); } } // Initialize calculator when page loads document.addEventListener('DOMContentLoaded', initCalculator);

Simple, scientific, and percentage calculators with an export option are also important tools to anyone who needs some accuracy when making calculations. These calculators provide the simple but effective means of solving various everyday problems or the more advanced equations. These calculators take care of it all effortlessly whether it is a simple calculation of a percentage to get a discount or a complex scientific equation.

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Being a student, professional, or simply a person who works with numbers on a regular basis, these tools will allow you to simplify your task. The simplicity, scientific precision, and the capability to calculate percentages combined with the ability to export makes them ideal to a large variety of users. Become more efficient and organized now, using calculators that will satisfy all your mathematical requirements.