Fast Scientific Calculator

Scientific Calculator

function appendToDisplay(value) { var display = document.getElementById('calcDisplay'); display.value += value; } function clearDisplay() { document.getElementById('calcDisplay').value = "; document.getElementById('calcResult').innerText = "; } function backspace() { var display = document.getElementById('calcDisplay'); display.value = display.value.slice(0, -1); } function calculateResult() { var display = document.getElementById('calcDisplay'); var expression = display.value; var resultDiv = document.getElementById('calcResult'); if (expression.trim() === ") { resultDiv.innerText = 'Please enter an expression.'; return; } // Pre-process the expression for Math functions and constants var processedExpression = expression; processedExpression = processedExpression.replace(/pi/g, 'Math.PI'); processedExpression = processedExpression.replace(/e/g, 'Math.E'); processedExpression = processedExpression.replace(/sqrt\(/g, 'Math.sqrt('); processedExpression = processedExpression.replace(/sin\(/g, 'Math.sin('); processedExpression = processedExpression.replace(/cos\(/g, 'Math.cos('); processedExpression = processedExpression.replace(/tan\(/g, 'Math.tan('); processedExpression = processedExpression.replace(/log\(/g, 'Math.log10('); // Assuming log is base 10 processedExpression = processedExpression.replace(/ln\(/g, 'Math.log('); // Natural log processedExpression = processedExpression.replace(/\^/g, '**'); // Exponentiation // Basic validation to prevent arbitrary code execution // Remove all allowed tokens and check if anything is left var cleanedExpression = processedExpression.replace(/Math\.PI|Math\.E|Math\.sin|Math\.cos|Math\.tan|Math\.log10|Math\.log|Math\.sqrt|\*\*|[0-9+\-*/().\s]/g, "); if (cleanedExpression.length > 0) { resultDiv.innerText = 'Error: Invalid characters or functions detected.'; return; } try { var result = eval(processedExpression); if (isNaN(result) || !isFinite(result)) { resultDiv.innerText = 'Error: Invalid calculation (e.g., division by zero, log of negative).'; } else { resultDiv.innerText = 'Result: ' + result; display.value = result; // Set the display to the result for further calculations } } catch (error) { resultDiv.innerText = 'Error: ' + error.message; } }

Understanding the Fast Scientific Calculator

A scientific calculator is an essential tool for anyone dealing with mathematics, science, or engineering. Unlike a basic calculator that handles only fundamental arithmetic operations, a scientific calculator can perform complex calculations involving trigonometry, logarithms, exponents, and more. This online scientific calculator provides a quick and easy way to solve a wide range of mathematical problems directly in your browser.

What Can This Calculator Do?

Our fast scientific calculator supports the following operations and functions:

  • Basic Arithmetic: Addition (+), Subtraction (-), Multiplication (*), Division (/)
  • Exponents: Power (xy, represented as `^` in the input)
  • Roots: Square Root (√, represented as `sqrt(`)
  • Trigonometric Functions: Sine (sin), Cosine (cos), Tangent (tan). Note: These functions operate on angles in radians.
  • Logarithms: Base-10 Logarithm (log), Natural Logarithm (ln)
  • Constants: Pi (π, represented as `pi`), Euler's Number (e, represented as `e`)
  • Parentheses: Use `(` and `)` to define the order of operations.

How to Use the Calculator

  1. Enter Your Expression: Click the number and function buttons to build your mathematical expression in the display field. For example, to calculate sin(90 degrees), you would first convert 90 degrees to radians (90 * π / 180), then input `sin(90 * pi / 180)`.
  2. Use Functions: For functions like `sin`, `cos`, `tan`, `log`, `ln`, and `sqrt`, click the respective button, and it will append the function name followed by an opening parenthesis (e.g., `sin(`). You then need to enter the argument and close the parenthesis.
  3. Constants: Click `π` or `e` to insert `pi` or `e` into your expression.
  4. Clear: The 'C' button clears the entire display.
  5. Backspace: The `⌫` button removes the last character entered.
  6. Calculate: Press the '=' button to evaluate the expression. The result will appear below the calculator, and the display will update with the result, allowing you to continue calculations.

Examples of Calculations

Here are a few examples to demonstrate how to use the calculator:

  • Basic Arithmetic:
    • (5 + 3) * 2 → Result: 16
    • 10 / (2 - 7) → Result: -2
  • Exponents and Roots:
    • 2^3 → Result: 8
    • sqrt(25) → Result: 5
    • (3 + 1)^2 → Result: 16
  • Trigonometry (in Radians):
    • sin(pi / 2) → Result: 1 (sin of 90 degrees)
    • cos(0) → Result: 1
    • tan(pi / 4) → Result: 1 (tan of 45 degrees)
  • Logarithms:
    • log(100) → Result: 2 (log base 10 of 100)
    • ln(e) → Result: 1 (natural log of e)
  • Combined Operations:
    • (sin(pi) + log(100)) * 5 → Result: 10
    • sqrt(9) + (2^4) - (pi * 2) → Result: 12.7168...

This calculator is designed for quick, on-the-fly scientific calculations, making complex math more accessible.

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