diff --git a/jjcc.txt b/jjcc.txt
new file mode 100644
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--- /dev/null
+++ b/jjcc.txt
@@ -0,0 +1,43 @@
+package cn.csj.oo3;
+
+import java.util.Scanner;
+
+public class test {
+	public static void main (String[] args) {
+		Scanner input = new Scanner(System.in);
+		double a = input.nextInt();
+		double b = input.nextInt();
+	
+		sum(a,b);
+		subtraction(a,b);
+		mul(a,b);
+		division(a,b);
+	}
+
+	 private static void sum(double a, double b) {
+		double resum=a+b;
+		System.out.println(a+"+"+b+"="+resum);
+	}
+	
+	private static void subtraction(double a,double b) {
+		double resub=a-b;
+		System.out.println(a+"-"+b+"="+resub);
+	}
+	
+	private static void mul(double a,double b) {
+		double remul=a*b;
+		System.out.println(a+"*"+b+"="+remul);
+	}
+	
+	private static void division(double a,double b) {
+		double redivision=0;
+		if(b!=0) {
+			redivision=a/b;
+		}
+		else {
+			redivision=0;   /*表示错误*/
+		}
+		System.out.println(a+"÷"+b+"="+redivision);
+	}
+
+}