diff --git a/add.java b/add.java
new file mode 100644
index 0000000..712b637
--- /dev/null
+++ b/add.java
@@ -0,0 +1,7 @@
+public class add
+  {
+    public static void main(String args[]){
+      System.out.println("hello world");
+    }
+  }
+
diff --git a/add.py b/add.py
index c571323..c2dc2b3 100644
--- a/add.py
+++ b/add.py
@@ -1,4 +1,4 @@
-a=8
-b=4
-c=a+b
-print c
+a=25
+b=9
+d=a+b
+print d
diff --git a/calculator b/calculator
index 80a04da..a007abc 100644
--- a/calculator
+++ b/calculator
@@ -13,7 +13,7 @@ int main() {
     case '+':
       printf("%.1lf + %.1lf = %.1lf", first, second, first + second);
       break;
-    case '-':
+    case '%':
       printf("%.1lf - %.1lf = %.1lf", first, second, first - second);
       break;
     case '*':