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import java.text.DecimalFormat; import java.util.Scanner; public class Zhidao { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); try { System.out.print("请输入第一个数:"); double x = scanner.nextDouble(); System.out.print("请输入第二个数:"); double y = scanner.nextDouble(); System.out.print("请输入运算符:"); String s = scanner.next(); char z = s.charAt(0); js.yunsuan(x, y, z); } catch (Exception e) { System.out.println("请输入正确的数据!"); } } } import java.text.DecimalFormat; public class js { public static void yunsuan(double x, double y, Character z) { DecimalFormat r = new DecimalFormat(); r.applyPattern("#0.00"); if (z.equals(‘+‘)) { System.out.println(x + "+" + y + "=" + r.format((x + y))); } else if (z.equals(‘-‘)) { System.out.println(x + "-" + y + "=" + r.format((x - y))); } else if (z.equals(‘*‘)) { System.out.println(x + "*" + y + "=" + r.format((x * y))); } else if (z.equals(‘/‘)) { if (y == 0) { System.out.println("被除数不能为0"); } else { System.out.println(x + "/" + y + "=" + r.format((x / y))); } } else { System.out.println("无法识别改运算符"); } } }
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原文地址:http://www.cnblogs.com/diaoyi/p/4468252.html