diff --git a/cal4.java b/cal4.java
deleted file mode 100644
index dd7d00e..0000000
--- a/cal4.java
+++ /dev/null
@@ -1,31 +0,0 @@
-package calculator;
-
-import java.util.Scanner;
-
-public class cal4 {
-		public cal4() {
-			Scanner inScanner=new Scanner(System.in);
-			System.out.print("请输入第一位运算数：");
-			double a=inScanner.nextInt();
-			System.out.print("请输入第二位运算数：");
-			double b=inScanner.nextInt();
-			System.out.print("请输入将要运算的运算符：");
-			String op=inScanner.next();
-			char ch=op.charAt(0);
-			double sum=cala(a, b, ch);
-			System.out.println("结果为:"+sum);
-		}
-		
-		public static double cala(double x,double y,char op) {
-			switch (op) {
-			case '+': return x+y;
-			case '-': return x-y;
-			case '*': return x*y;
-			case '/': 
-				if(y==0) return 0;
-				else return x/y;
-			default:
-				return x;
-			}
-		}
-}
\ No newline at end of file