दशमलव सटीकता कैलकुलेटर

❌ Native JavaScript (Incorrect)

// Price calculation gone wrong
const price = 0.1;
const quantity = 3;
const total = price * quantity;
console.log(total); // 0.30000000000000004

// Tax calculation error
const amount = 0.2;
const tax = 0.1;
const withTax = amount + tax;
console.log(withTax); // 0.30000000000000004

✅ Using Decimal.js (Correct)

import Decimal from 'decimal.js';

// Accurate price calculation
const price = new Decimal(0.1);
const quantity = new Decimal(3);
const total = price.times(quantity);
console.log(total.toString()); // "0.3"

// Accurate tax calculation
const amount = new Decimal(0.2);
const tax = new Decimal(0.1);
const withTax = amount.plus(tax);
console.log(withTax.toString()); // "0.3"

// Set precision for financial calculations
Decimal.set({ precision: 10, rounding: 4 });

// Chain operations
const result = new Decimal('19.99')
  .times('1.08')        // Add 8% tax
  .toDecimalPlaces(2);  // Round to 2 decimals
console.log(result.toString()); // "21.59"

🔧 Alternative: Manual Integer Math

// Convert to cents for calculations
function multiply(a, b, decimals = 2) {
  const multiplier = Math.pow(10, decimals);
  const intA = Math.round(a * multiplier);
  const intB = Math.round(b * multiplier);
  return (intA * intB) / (multiplier * multiplier);
}

const price = 0.1;
const quantity = 3;
console.log(multiply(price, quantity)); // 0.03

// Note: This approach is limited and error-prone
// For production use, prefer Decimal.js