Introduction to Programming

Arithmetic unary (+  -) and binary operators:  +   -   *   /   %

The best way to understand operators is to see them in action. Here is our demo application code (with results captured in comments) that explains the unary operators + and -:

public class Ch09DemoApp {  public static void main(String[] args) {    int i = 2;   //unary "+" is assumed by default    int x = -i;  //unary "-" makes positive become negative    System.out.println(x);   //prints: -2    int y = -x;  //unary "-" makes negative become positive    System.out.println(y);   //prints: 2  }}

And the following code demonstrates the binary operators  +, -, *, /, and %:

int z = x + y;              //binary "+" means "add"System.out.println(z);      //prints: 0z = x - y;                  //binary "-" means "subtract"System.out.println(z) ...