domain- instead of invalid-arg-error

src/calc.cpp

@@ -9,7 +9,7 @@ int multiply(int a, int b) { return a * b; }
 int modulo(  int a, int b) { return a % b; }
 int divide(  int a, int b) { 
   if(b == 0) {
-    throw std::invalid_argument("Division by 0.");
+    throw std::domain_error("Division by 0.");
   }
   return a / b;
 }