first commit

Main.java

@@ -0,0 +1,24 @@
+ class Jiajianchengchu
+{
+    public double jia(double c,double b)
+
+    {
+        return c+b;
+    }
+
+    public double jian(double b,double t)
+
+    {
+        return b-t;
+    }
+    public double cheng(double y,double u)
+    {
+        return y*u;
+
+    }
+    public double chu(double i,double k)
+    {
+        if(k!=0)
+        return i/k;
+    }
+}