diff --git a/.github/workflows/c-cpp.yml b/.github/workflows/c-cpp.yml
new file mode 100644
index 0000000..a383a52
--- /dev/null
+++ b/.github/workflows/c-cpp.yml
@@ -0,0 +1,23 @@
+name: C/C++ CI
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: configure
+      run: ./configure
+    - name: make
+      run: make
+    - name: make check
+      run: make check
+    - name: make distcheck
+      run: make distcheck
diff --git a/README.md b/README.md
index 643700d..3db12de 100644
--- a/README.md
+++ b/README.md
@@ -1 +1 @@
-# advprogram
\ No newline at end of file
+22026555 - Lê Công Hoàng K67J
diff --git a/lec0-gameover/GameOver_22026555.cpp b/lec0-gameover/GameOver_22026555.cpp
new file mode 100644
index 0000000..7eadb14
--- /dev/null
+++ b/lec0-gameover/GameOver_22026555.cpp
@@ -0,0 +1,6 @@
+#include <iostream>
+int main()
+{
+	std::cout << "Game Over !" << std::endl;
+	return 0;
+}	
diff --git a/lec1-simplecalculator/UpdateSimpleCalc_22026555.cpp b/lec1-simplecalculator/UpdateSimpleCalc_22026555.cpp
new file mode 100644
index 0000000..b976f46
--- /dev/null
+++ b/lec1-simplecalculator/UpdateSimpleCalc_22026555.cpp
@@ -0,0 +1,140 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+int arithmetic(double num1, double num2, char op);
+double sothuc(string op, double num);
+int main(int argc, char* argv[])
+{
+    if (argc == 4)
+    {
+	string n = argv[2];
+    int k = n.length();
+    if (k != 1)
+    {
+    	cout << "Invalid operator" << endl; return 0;
+	}
+	int num1, num2;	char op;
+	string tmp = argv[1];
+	string tmpp = argv[3];
+	for (int i = 0; i < tmp.length(); i++)
+	{
+		if (tmp[i] < '0' || tmp[i] > '9')
+		{
+			cout << "Invalid number"; exit(1);
+		}
+	}
+	for (int i = 0; i < tmpp.length(); i++)
+	{
+		if (tmpp[i] < '0' || tmpp[i] > '9')
+		{
+			cout << "Invalid number"; exit(1);
+		}
+	}
+	num1 = atof(argv[1]);	
+    op = argv[2][0];
+    num2 = atof(argv[3]);
+	cout << arithmetic(num1, num2, op) << endl;
+	return 0;
+	}
+	else if (argc == 3)
+	{
+		string n = argv[1];
+		int k = n.length();
+		if (k == 3){
+            if ((n != "cos") && (n != "sin") && (n != "tan" && n != "cot")){
+                cout<< "Invalid operator";
+                exit(1);
+            }
+        }
+        if (k == 4){
+            if (n != "sqrt"){
+                cout<< "Invalid operator";
+                exit(1);
+            }
+        }
+        string tmp = argv[2];
+        for (int i = 0; i < tmp.length(); i++)
+	{
+		if (tmp[i] < '0' || tmp[i] > '9')
+		{
+			cout << "Invalid number"; exit(1);
+		}
+	}
+        double num;
+        num = atof(argv[2]);
+        cout<< sothuc(n, num);
+    }
+    else {
+        cout<< "Invalid operator";
+        exit(1);
+    }
+}
+
+int arithmetic(double num1, double num2, char op)
+{
+    switch (op)
+    {
+    case '+':
+        return num1 + num2;
+    case '-':
+        return num1 - num2;
+    case '*':
+        return num1 * num2;
+    case '/':
+        if (num2 == 0)
+        {
+            cout << "Invalid divisor" << endl;
+            exit(1);
+        }
+        else
+            return num1 / num2;
+    case '%':
+        if (num2 == 0 || num2 != (int)num2 || num1 != (int)num1) 
+        {
+            cout << "Invalid divisor" << endl;
+            exit(1);
+        }
+        else
+            return int(num1) % int(num2);
+    default:
+        cout << "Invalid operator" << endl;
+        exit(1);
+    }
+}
+double sothuc(string op, double num)
+{
+	if (op == "sin")
+	{
+		return sin(num);	
+	}
+	else if (op == "cos")
+	{
+		return cos(num);
+	}
+	else if (op == "tan")
+	{
+		if (cos(num) == 0)
+		{
+			cout << "Invalid Number"; exit(1);
+		}
+		else return tan(num);	
+	}
+	else if (op == "cot")
+	{
+		if (sin(num) == 0)
+		{
+			cout << "Invalid Number"; exit(1);
+		}
+		else return (1/tan(num));
+	}
+	else if (op == "sqrt")
+	{
+		if (num < 0)
+		{
+			cout << "Invalid Number"; exit(1);
+		}
+		else return sqrt(num);
+	}
+	else {cout << "Invalid operator" << endl;
+        	exit(1);}
+}
diff --git a/lec2-guessit/UpdatedGuessIt_22026555.cpp b/lec2-guessit/UpdatedGuessIt_22026555.cpp
new file mode 100644
index 0000000..18dddbb
--- /dev/null
+++ b/lec2-guessit/UpdatedGuessIt_22026555.cpp
@@ -0,0 +1,75 @@
+#include <bits/stdc++.h>
+using namespace std;
+int generateRandomNumber();
+int getPlayerGuess();
+int solandoan = 0; int tongdiem = 0;
+void playGuessIt();
+void printAnswer(int number, int randomNumber);
+int main()
+{
+  bool play_again = true;
+  while (play_again)
+  {
+    playGuessIt();
+	cout << "One more time (y / n)?";
+    char answer;
+    cin >> answer;
+    if (tolower(answer) != 'y')
+    {
+        play_again = false;
+    }
+  }
+  return 0;
+}
+
+void playGuessIt()
+{
+	int randomNumber = generateRandomNumber();
+	    int number;
+	    do {
+	        number = getPlayerGuess();
+	        printAnswer(number, randomNumber);
+	    } while (number != randomNumber);
+}
+int generateRandomNumber()
+{
+    int a;
+    srand (time(0));
+    a = rand() % 100 + 1;
+    return a;
+}
+
+int getPlayerGuess()
+{
+    int number;
+    cout << endl << "Enter your number between 1 and 100: ";
+    cin >> number;
+    while(cin.fail())
+    {
+        cin.clear();
+        cin.ignore();
+        cin >> number;
+    }
+    if (number > 100 || number <= 0)
+    {
+    	return number;
+    }
+    else {solandoan++;
+    return number;}
+}
+
+void printAnswer(int number, int randomNumber)
+{
+	if (number > 100 || number <= 0) {
+        cout <<"Invalid number, guess again." << endl;}
+	else if (number > randomNumber) {
+        cout <<"Your number is higher." << endl;
+    } else if (number < randomNumber) {
+        cout <<"Your number is lower." << endl;
+    } else {
+        cout << "Congratulation! You win." << endl;
+        cout << "So lan doan cua ban la: " << solandoan << endl;
+        cout << "Diem cua ban la: " << 100 - solandoan << endl;
+    }
+}
+