example2_5.java

书中的例题

public class  Example2_5

{public static void main(String[] agrs)
 {//定义几个变量并赋值
  int a=41;
  int b=21;
  double x=6.4;
  double y=3.22;
  System.out.println("变量数值：");
  System.out.println("a="+a);
  System.out.println("b="+b);
  System.out.println("x="+x);
  System.out.println("y="+y);
  //加法
  System.out.println("加:");
  System.out.println("a+b="+(a+b));
  System.out.println("x+y="+(x+y));
  //减法
  System.out.println("减:");
  System.out.println("a-b="+(a-b));
  System.out.println("x-y="+(x-y));
  //乘法
  System.out.println("乘:");
  System.out.println("a*b="+(a*b));
  System.out.println("x*y="+(x*y));
  //除法
  System.out.println("除:");
  System.out.println("a/b="+(a/b));
  System.out.println("x/y="+(x/y));
  //从除法中求得余数
  System.out.println("计算余数:");
  System.out.println("a%b="+(a%b));
  System.out.println("x%y="+(x%y));
  //混合类型
  System.out.println("混合类型:");
  System.out.println("b+y="+(b+y));
  System.out.println("a*x="+(a*x));
 }
}