diff --git a/calculator.cpp b/calculator.cpp
new file mode 100644
index 0000000..abc1234
--- /dev/null
+++ b/calculator.cpp
@@ -0,0 +1,28 @@
+#include "calculator.h"
+
+double Calculator::add(double a, double b) {
+    return a + b;
+}
+
+double Calculator::divide(double a, double b) {
+    if (b == 0) {
+        throw std::invalid_argument("Division by zero");
+    }
+    return a / b;
+}
+
+std::vector<double> Calculator::processNumbers(const std::vector<double>& numbers, std::function<double(double)> processor) {
+    std::vector<double> result;
+    
+    for (const auto& num : numbers) {
+        result.push_back(processor(num));
+    }
+    
+    return result;
+}