运算符与自增自减
package cperator;public class Demo01 {public static void main(String[] args) {//二元运算符//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);}
}
package cperator;public class Demo02 {public static void main(String[] args) {long a = 123123123123L;int b = 123;short c = 10;byte d = 8;System.out.println(a+b+c+d);//LongSystem.out.println(b+c+d);//IntSystem.out.println(c+d);//Int}
}
package cperator;public class Demo03 {public static void main(String[] args) {//关系运算返回结果 ：正确，错误 布尔值// ifint a = 10;int b = 20;int c = 21;//取余模运算System.out.println(c%a);//c/a 21/10 = 2...1System.out.println(a>b);System.out.println(a<b);System.out.println(a==b);System.out.println(a!=b);}
}
package cperator;public class Demo04 {public static void main(String[] args) {//++ -- 自增，自减 一元运算符int a = 3;int b = a++;//执行完这行代码后，先给b赋值，再自增//a++ a=a+1System.out.println(a);//a++ a=a+1int c = ++a;//执行完这行代码前，先自增，再给b赋值System.out.println(a);System.out.println(b);System.out.println(c);//幂运算 2^3 2*2*2 = 8double pow = Math.pow(3, 2);System.out.println(pow);}
}
)
