var display = document.getElementById('calc-display');
var historyDiv = document.getElementById('calc-history');
function appendValue(val) {
if (display.value === 'Error') display.value = ";
display.value += val;
}
function appendOp(op) {
if (display.value === 'Error') display.value = ";
display.value += op;
}
function clearCalc() {
display.value = ";
historyDiv.innerText = ";
}
function factorial() {
var n = parseFloat(display.value);
if (isNaN(n)) {
display.value = 'Error';
return;
}
if (n < 0) {
display.value = 'Error';
return;
}
var res = 1;
for (var i = 2; i <= n; i++) res *= i;
historyDiv.innerText = n + '!';
display.value = res;
}
function calculateResult() {
var expression = display.value;
if (!expression) return;
historyDiv.innerText = expression + ' =';
try {
var formattedExpr = expression
.replace(/sin\(/g, 'Math.sin(')
.replace(/cos\(/g, 'Math.cos(')
.replace(/tan\(/g, 'Math.tan(')
.replace(/log\(/g, 'Math.log10(')
.replace(/ln\(/g, 'Math.log(')
.replace(/sqrt\(/g, 'Math.sqrt(')
.replace(/pow\(/g, 'Math.pow(')
.replace(/exp\(/g, 'Math.exp(')
.replace(/PI/g, 'Math.PI')
.replace(/E/g, 'Math.E');
// Basic safety check for eval
var result = eval(formattedExpr);
if (result === Infinity || isNaN(result)) {
display.value = 'Error';
} else {
// Round to handle floating point precision
display.value = Number(Math.round(result + 'e10') + 'e-10');
}
} catch (e) {
display.value = 'Error';
}
}
Understanding the Scientific Calculator
A scientific calculator is an essential tool for students, engineers, and scientists. Unlike a standard calculator that only performs basic arithmetic (addition, subtraction, multiplication, and division), a scientific calculator handles complex mathematical operations including trigonometry, logarithms, and exponential functions.
Core Functions and Formulas
The online scientific calculator uses various mathematical constants and functions to solve equations. Here are the primary operations you can perform:
Trigonometry: Calculate sin(x), cos(x), and tan(x). These are fundamental for geometry and physics. Note: Our calculator processes these in radians.
Logarithms:log(x) computes the base-10 logarithm, while ln(x) computes the natural logarithm (base e).
Exponents and Roots: Use xʸ for power functions and √ for square roots. For example, 23 = 8.
Factorials: Represented as n!, this calculates the product of all positive integers up to n.
Common Calculation Examples
Operation
Formula/Input
Typical Result
Area of a Circle
PI * 5 * 5
78.5398…
Hypotenuse (a=3, b=4)
sqrt(3*3 + 4*4)
5
Logarithmic Scale
log(1000)
3
Factorial of 5
5!
120
Scientific Constants
This calculator includes built-in buttons for major constants:
Pi (π): Approximately 3.14159, representing the ratio of a circle's circumference to its diameter.
Euler's Number (e): Approximately 2.71828, which is the base of natural logarithms and crucial for growth and decay calculations.
Tips for Accurate Use
1. Parentheses: Always use parentheses ( ) to define the order of operations, especially in complex fractions or nested functions.
2. Clear Entry: Use the AC button to reset the calculation if you make a mistake.
3. Syntax: Ensure functions like sin or sqrt are followed by an opening parenthesis and closed correctly after the numerical value.