作业5.1
1 package case1; 2 import java.io.BufferedReader; 3 import java.io.InputStreamReader; 4 import java.util.Scanner; 5 public class no1 { 6 public static void main(String[] args) { 7 int x,y; 8 String z ,p,p1; 9 Scanner inr = new Scanner(System.in); 10 BufferedReader in=new BufferedReader(new InputStreamReader(System.in)) ; 11 12 System.out.print("请输入第一个数字:") ; 13 while(true) 14 { 15 try 16 { 17 p=in.readLine(); 18 //如果转换异常则输入的不是数字 19 x=Integer.parseInt(p); 20 if(x>0) 21 { 22 System.out.println("\n") ; 23 } 24 break; 25 } 26 catch(Exception e) 27 { 28 System.out.println("\n错误") ; 29 } 30 } 31 32 System.out.print("请输入第二个数字:") ; 33 while(true) 34 { 35 36 try 37 { 38 p1=in.readLine(); 39 //如果转换异常则输入的不是数字 40 y=Integer.parseInt(p1); 41 if(y>0) 42 { 43 System.out.println("\n") ; 44 } 45 break; 46 } 47 catch(Exception e) 48 { 49 System.out.println("\n错误") ; 50 } 51 } 52 53 System.out.println("请输入运算符(+,-,*,/)："); 54 z = inr.nextLine(); 55 56 57 System.out.println("\n"+x+" "+z+" "+y+"="); 58 no2 test = new no2(); 59 test.case1(z, x, y); 60 } 61 } 62 63 64 65 package case1; 66 67 public class no2 { 68 public void case1(String cc, double a, double b) { 69 if (cc.equals("+")) { 70 System.out.println(a + b); 71 } else if (cc.equals("-")) { 72 System.out.println(a - b); 73 } else if (cc.equals("*")) { 74 System.out.println(a * b); 75 } else if (cc.equals("/")) { 76 if (b != 0) { 77 System.out.println(a / b); 78 } else { 79 System.out.println("division by zero！"); 80 } 81 } else { 82 System.out.println("运算符不符合！"); 83 } 84 } 85 }
运行截图：
同伴： 叶鹏 ---- http://home.cnblogs.com/u/yeyepengpeng/
