## How do I calculate the length of hypotenuse?

Hypot is a mathematical function defined to calculate the length of the hypotenuse of a right-angle triangle. It was designed to avoid errors arising due to limited-precision calculations performed on computers.

From: Wikipedia

The `Math.hypot(double x, double y)` return the `sqrt(x``2``+ y``2``)` without intermediate overflow or underflow. The result will be same with this calculation
`Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2))`.

``````package org.kodejava.example.math;

public class HypotExample {
public static void main(String[] args) {
double number1 = 3.0d;
double number2 = 5.0d;

// calculate square root of total value of
// number1 ^ 2 + number2 ^ 2
double sqr = Math.hypot(number1, number2);

System.out.println("Total value = " + (Math.pow(number1, 2) + Math.pow(number2, 2)));
System.out.println("Square root = " + sqr);
}
}
``````

## How do I calculate exponential function?

In mathematics, the exponential function is the function `e``x`, where `e` is the number (approximately 2.718281828) such that the function `e``x` equals its own derivative. The function `f(x) = e``x` at the point `x = 0` is equal to `1`.

``````package org.kodejava.example.math;

public class ExponentExample {

public static void main(String[] args) {
double x = 0.0d;

// calculates e raised to the power of x (e^x)
double fx = Math.exp(x);

// calculates e raised to the power of x minus 1 (e^x - 1)
double fxm1 = Math.expm1(x);

System.out.println("fx   = " + fx);
System.out.println("fxm1 = " + fxm1);
}
}
``````