diff --git a/calculator.cpp b/calculator.cpp
index 3c63184..b91afea 100644
--- a/calculator.cpp
+++ b/calculator.cpp
@@ -1,11 +1,11 @@
 #include "calculator.h"
 
-int Calculator::Add (int a, int b)
+int Calculator::Add (double a, double b)
 {
     return a + b;
 }
 
-int Calculator::Sub (int a, int b)
+int Calculator::Sub (double a, double b)
 {
     return Add (a, -b);
 }
diff --git a/calculator.h b/calculator.h
index 84ff414..3740907 100644
--- a/calculator.h
+++ b/calculator.h
@@ -4,8 +4,8 @@
 class Calculator
 {
     public:
-        int Add (int, int);
-        int Sub (int, int);
+        int Add (double, double);
+        int Sub (double, double);
 };
 
 #endif//CALCULATOR_H