diff --git a/CMakeLists.txt b/CMakeLists.txt
index fe9eea8..d910bfe 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,5 +3,6 @@ set(CMAKE_CXX_COMPILER "clang++")
 set(CMAKE_CXX_FLAGS    "${CMAKE_CXX_FLAGS} -std=c++11")
 set(CMAKE_CXX_FLAGS    "${CMAKE_CXX_FLAGS} -Wall -pedantic -Wextra -Weffc++")
 
+add_executable(typetest typetest.cpp)
 add_executable(auto_ptr auto_ptr.cpp)
 add_executable(unique_ptr unique_ptr.cpp)
diff --git a/typetest.cpp b/typetest.cpp
new file mode 100644
index 0000000..c7cc2b7
--- /dev/null
+++ b/typetest.cpp
@@ -0,0 +1,33 @@
+#include <cassert>
+#include <iostream>
+
+int main()
+{
+  int someInteger = 256;
+  short someShort;
+  long someLong;
+  float someFloat;
+  double someDouble;
+
+  someInteger++;
+  assert(someInteger == 257);
+
+  someInteger *= 2;
+  assert(someInteger == 514);
+
+  someShort = (short) someInteger;
+  assert((int) someShort == 514); // (short more than 1 byte)
+
+  someLong = someShort * 10000;
+  assert(someLong == 5140000l);
+
+  someFloat = someLong * 0.785;
+  assert(abs(someFloat - 4034900.000) < 0.0001);
+
+  someDouble = (double)someFloat / 100000;
+  assert(abs(someDouble - 40.349) < 0.0001);
+
+  std::cout << someDouble << std::endl;
+
+  return 0;
+}