语言基础

3.2.1 算术操作符

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以下有一个例程，ArithmeticDemo，它定义了两个整型数和两个双精度的浮点数并且使用五种算术运算符来完成不同的运算操作。这个程序同时使用了+符号来连接字符串。程序如下：

public class ArithmeticDemo { public static void main(String[] args) { //定义几个数 int i = 37; int j = 42; double x = 27.475; double y = 7.22; System.out.println("变量数值..."); System.out.println(" i = " + i); System.out.println(" j = " + j); System.out.println(" x = " + x); System.out.println(" y = " + y); //加 System.out.println("加..."); System.out.println(" i + j = " + (i + j)); System.out.println(" x + y = " + (x + y)); //减 System.out.println("减..."); System.out.println(" i - j = " + (i - j)); System.out.println(" x - y = " + (x - y)); //乘 System.out.println("乘..."); System.out.println(" i * j = " + (i * j)); System.out.println(" x * y = " + (x * y)); //除 System.out.println("除..."); System.out.println(" i / j = " + (i / j)); 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(" i % j = " + (i % j)); System.out.println(" x % y = " + (x % y)); //混合类型 System.out.println("混合类型..."); System.out.println(" j + y = " + (j + y)); System.out.println(" i * x = " + (i * x)); } }

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