How to use Math function for mathematical calculations in Java

Java is an object-oriented programming language that provides us with many built-in mathematical functions, the most important of which is the Math class. The Math class contains many commonly used mathematical functions, such as trigonometric functions, exponential functions, logarithmic functions and some basic arithmetic functions, which can facilitate mathematical calculations.

The Math class is a static class provided by Java, so we can use the functions it provides directly through the class name. Here are some examples of using Math class functions:

1. Finding the absolute value

We can get the absolute value of a number through the abs() method of the Math class.

Sample code:

double num = -3.14;
double absNum = Math.abs(num);
System.out.println(absNum); // 输出：3.14

2. Find the maximum and minimum values

We can use the max() and min() methods of the Math class to calculate The maximum and minimum values ​​of a set of numbers. Both methods accept two parameters and can be overloaded in multiple versions to support different types of parameters.

Sample code:

int a = 10, b = 20;
int maxNum = Math.max(a, b);
int minNum = Math.min(a, b);
System.out.println("max:" + maxNum); // 输出：20
System.out.println("min:" + minNum); // 输出：10

3. Finding the power

We can use the pow() method of the Math class to find the nth power of a number . The pow() method accepts two parameters, the first parameter is the base, and the second parameter is the exponent.

Sample code:

double base = 2, exponent = 3;
double powVal = Math.pow(base, exponent);
System.out.println(powVal); // 输出：8.0

4. Find the square root and cube root

We can use the sqrt() method of the Math class to find the square root of a number, using The cbrt() method finds the cube root of a number.

Sample code:

double num = 64;
double sqrtVal = Math.sqrt(num);
double cbrtVal = Math.cbrt(num);
System.out.println(sqrtVal); // 输出：8.0
System.out.println(cbrtVal); // 输出：4.0

5. Finding the logarithm

We can use the log() method of the Math class to find the natural logarithm of a number, Use the log10() method to find the base 10 logarithm of a number.

Sample code:

double num = 100;
double logVal = Math.log(num);
double log10Val = Math.log10(num);
System.out.println(logVal); // 输出：4.605170185988092
System.out.println(log10Val); // 输出：2.0

6. Find sine, cosine and tangent

We can use sin(), cos() and tan( of Math class ) method to find the sine, cosine, and tangent of an angle. These functions accept an angle parameter in radians.

Sample code:

double angle = 30;
double radian = Math.toRadians(angle);
double sinVal = Math.sin(radian);
double cosVal = Math.cos(radian);
double tanVal = Math.tan(radian);
System.out.println(sinVal); // 输出：0.49999999999999994
System.out.println(cosVal); // 输出：0.8660254037844387
System.out.println(tanVal); // 输出：0.5773502691896257

In addition to the functions listed above, the Math class also contains some other functions, such as rounding, rounding, random number generation, etc. When performing mathematical calculations, you can choose the appropriate Math function according to actual needs to improve the efficiency and readability of the code.

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