hello.txt

jjcc2.txt

@@ -0,0 +1,33 @@
+package cn.csj.oo3;
+
+import java.util.Scanner;
+
+public class jjcc {
+	
+	 static void sum(double a, double b) {
+		double resum=a+b;
+		System.out.println(a+"+"+b+"="+resum);
+	}
+	
+	static void subtraction(double a,double b) {
+		double resub=a-b;
+		System.out.println(a+"-"+b+"="+resub);
+	}
+	
+	static void mul(double a,double b) {
+		double remul=a*b;
+		System.out.println(a+"*"+b+"="+remul);
+	}
+	
+	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);
+	}
+
+}