加减乘除运算符

package operator;//当前的包

public class Demo01 {
public static void main(String[] args) {
//二元运算符号
//Ctrl+D 复制当前行到下一行
int a = 10;
int b = 20;
int c = 30;
int d = 40;
System.out.println(a+b);
System.out.println(a-b);
System.out.println(a*b);
System.out.println(a/(double)b);
}
}