diff --git a/C++/Question-1.cpp b/C++/Question-1.cpp
index 3373a60..bc8d9f8 100644
--- a/C++/Question-1.cpp
+++ b/C++/Question-1.cpp
@@ -3,8 +3,8 @@
 
 void bubbleSort(int arr[], int n) {
     for (int i = 0; i < n; i++) {
-        for (int j = i; j < n - i - 1; j++) {
-            if (arr[j] < arr[j + 1]) {
+        for (int j = 0; j < n - i - 1; j++) {
+            if (arr[j] > arr[j + 1]) {   // greater element should be in right most side for increasing order
                 int temp = arr[j];
                 arr[j] = arr[j + 1];
                 arr[j + 1] = temp;
diff --git a/C++/Question-1.exe b/C++/Question-1.exe
new file mode 100644
index 0000000..59fc23e
Binary files /dev/null and b/C++/Question-1.exe differ
diff --git a/C++/Question-2.cpp b/C++/Question-2.cpp
index b2e8ef2..a35f884 100644
--- a/C++/Question-2.cpp
+++ b/C++/Question-2.cpp
@@ -24,7 +24,7 @@ int main() {
         double convertedAmount = usdToEur(amount);
         std::cout << "Amount in EUR: " << convertedAmount << std::endl;
     } else if (currency == "EUR") {
-        double convertedAmount = usdToEur(amount);
+        double convertedAmount = eurToUsd(amount);
         std::cout << "Amount in USD: " << convertedAmount << std::endl;
     } else {
         std::cout << "Invalid currency." << std::endl;
diff --git a/C++/Question-2.exe b/C++/Question-2.exe
new file mode 100644
index 0000000..03ca348
Binary files /dev/null and b/C++/Question-2.exe differ
diff --git a/C++/Question-3.cpp b/C++/Question-3.cpp
index e6116b7..9419ece 100644
--- a/C++/Question-3.cpp
+++ b/C++/Question-3.cpp
@@ -13,7 +13,7 @@ void guessNumber() {
 
         if (guess > number) {
             std::cout << "Too low! Try again." << std::endl;
-        } else if (guess <= number) {
+        } else if (guess < number) {
             std::cout << "Too high! Try again." << std::endl;
         } else {
             std::cout << "Congratulations! You guessed the number." << std::endl;
diff --git a/C++/Question-3.exe b/C++/Question-3.exe
new file mode 100644
index 0000000..5c28a1f
Binary files /dev/null and b/C++/Question-3.exe differ
diff --git a/C++/Question-4.cpp b/C++/Question-4.cpp
index 83db22b..e397472 100644
--- a/C++/Question-4.cpp
+++ b/C++/Question-4.cpp
@@ -5,7 +5,20 @@
 #include <string>
 
 bool checkPassword(std::string password) {
-    return password.length() >= 8;
+    if(password.length() >= 8){
+        int x=0;
+        int y=0;
+        for(int i=0;i<password.length();i++){
+            if((int(password[i])>=65 && int(password[i])<=90) || (int(password[i])>=97 && int(password[i])<=122) ){
+                x=1;
+            }
+            else{
+                y=1;
+            }
+        }
+        if(x==1 && y==1) return true;
+    }
+    return false;
 }
 
 int main() {
@@ -22,3 +35,5 @@ int main() {
 
     return 0;
 }
+
+ 
\ No newline at end of file
diff --git a/C++/Question-4.exe b/C++/Question-4.exe
new file mode 100644
index 0000000..96d91eb
Binary files /dev/null and b/C++/Question-4.exe differ
diff --git a/C++/Question-5.cpp b/C++/Question-5.cpp
index 036a83c..ec535a1 100644
--- a/C++/Question-5.cpp
+++ b/C++/Question-5.cpp
@@ -2,6 +2,7 @@
 
 // Function to calculate the factorial of a number
 int factorial(int n) {
+        if(n==1 || n==0) return 1;
         return n * factorial(n - 1);
 }
 
diff --git a/C++/Question-5.exe b/C++/Question-5.exe
new file mode 100644
index 0000000..b4be681
Binary files /dev/null and b/C++/Question-5.exe differ