diff --git a/examples/.gitignore b/examples/.gitignore
new file mode 100644
index 00000000..3c9a1c23
--- /dev/null
+++ b/examples/.gitignore
@@ -0,0 +1 @@
+pocketpy.h
diff --git a/examples/README.md b/examples/README.md
new file mode 100644
index 00000000..be5db77c
--- /dev/null
+++ b/examples/README.md
@@ -0,0 +1,12 @@
+# TODO
+- variations of print function
+- variable declaration
+- string, list, tuple, dictionary
+- basic operations
+- if else
+- for loop, while loop
+- json loads, dumps
+- exception handling
+
+
+clang++ --std=c++17 cjson.cpp -o cjson
diff --git a/examples/cjson.cpp b/examples/cjson.cpp
new file mode 100644
index 00000000..76ce7aa2
--- /dev/null
+++ b/examples/cjson.cpp
@@ -0,0 +1,19 @@
+#include "pocketpy.h"
+
+using namespace pkpy;
+
+int main(){
+    // Create a virtual machine
+    VM* vm = new VM();
+
+    // cjson loads and dumps!
+    vm->exec("import cjson");
+    vm->exec("dict = {'a': 1, 'b': [1, 3, 'Hello World'], 'c': {'a': 4}, 'd': None, 'd': True }");
+    vm->exec("json_str = cjson.dumps(dict)");
+    vm->exec("print(json_str)");
+    vm->exec("loaded_dict = cjson.loads(json_str)");
+    vm->exec("print(loaded_dict)");
+
+    delete vm;
+    return 0;
+}
diff --git a/examples/json.cpp b/examples/json.cpp
deleted file mode 100644
index e69de29b..00000000
diff --git a/examples/string_formatting.cpp b/examples/string_formatting.cpp
index e69de29b..8a25d3d9 100644
--- a/examples/string_formatting.cpp
+++ b/examples/string_formatting.cpp
@@ -0,0 +1,57 @@
+#include <iostream>
+#include "pocketpy.h"
+
+using namespace pkpy;
+
+
+int main(){
+    // Create a virtual machine
+    VM* vm = new VM();
+
+    //prints: Hello, World!
+    vm->exec("print(\"Hello, {}!\".format(\"World\"))");
+
+    //prints: I love Python
+    vm->exec("print('{} {} {}'.format('I', 'love', 'Python'))");
+
+    //prints: I love Python
+    vm->exec("print('{0} {1} {2}'.format('I', 'love', 'Python'))");
+    
+    //prints: Python love I
+    vm->exec("print('{2} {1} {0}'.format('I', 'love', 'Python'))");
+
+    //prints: pythonlovepython
+    vm->exec("print('{0}{1}{0}'.format('python', 'love'))");
+
+    //prints 
+    vm->exec("print('{k}={v}'.format(k='key', v='value'))");
+
+    vm->exec("print('{k}={k}'.format(k='key'))");
+    
+    vm->exec("print('{0}={1}'.format('{0}', '{1}'))");
+
+    vm->exec("print('{{{0}}}'.format(1))");
+
+    vm->exec("print('{0}{1}{1}'.format(1, 2, 3))");
+
+    vm->exec("try:");
+    vm->exec("@indent print('{0}={1}}'.format(1, 2)')");
+    vm->exec("    exit(1)");
+    vm->exec("except ValueError:");
+    vm->exec("    print('ValueError')");
+    vm->exec("print('{{{}xxx{}x}}'.format(1, 2))");
+    vm->exec("print('{{abc}}'.format())");
+
+// assert "{{{}xxx{}x}}".format(1, 2) == "{1xxx2x}"
+// assert "{{abc}}".format() == "{abc}"
+    // cjson loads and dumps!
+    // vm->exec("import cjson");
+    // vm->exec("dict = {'a': 1, 'b': [1, 3, 'Hello World'], 'c': {'a': 4}, 'd': None, 'd': True }");
+    // vm->exec("json_str = cjson.dumps(dict)");
+    // vm->exec("print(json_str)");
+    // vm->exec("loaded_dict = cjson.loads(json_str)");
+    // vm->exec("print(loaded_dict)");
+
+    delete vm;
+    return 0;
+}