first commit

c.java

@@ -0,0 +1,26 @@
+import java.util.Scanner;
+public class CALC{
+	public static void main(String args[]) {
+		double x;
+		double y;
+		String z;
+		Scanner sc=new Scanner(System.in);
+		System.out.println("输入第一个数");
+		x=sc.nextDouble();
+		System.out.println("输入运算符");
+		z=sc.next();
+		System.out.println("输入第二个数");
+		y=sc.nextDouble();
+		System.out.print("结果是：");
+		switch(z) {
+		case"+":System.out.println(x+y);
+		break;
+		case"-":System.out.println(x-y);
+		break;
+		case"*":System.out.println(x*y);
+		break;
+		case"/":System.out.println(x/y);
+		break;
+		}
+	}
+}