How to use Java arithmetic operators

1. , -, *, / are our commonly used arithmetic operators, representing addition, subtraction, multiplication and division.

In addition, we can also use remainder: %

System.out.println(1 + 2);
System.out.println(2 - 1);
System.out.println(1 * 2);
System.out.println(1 / 2);
System.out.println(1 % 2);

2. Division does not output 1/2=0.5. Why?

Since 1 and 2 are both integers, the expected result is 0.5 floating point, and Java performs integer division.

Below we declare that one of the parameters is a floating point type, allowing the compiler to automatically convert the type.

// 打印->0.5
System.out.println(1 / 2.0);

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