diff --git a/C++/Question-1.cpp b/C++/Question-1.cpp
index 3373a60..e6e355e 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]) {
                 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..480e503
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..cbd8171 100644
--- a/C++/Question-2.cpp
+++ b/C++/Question-2.cpp
@@ -4,11 +4,11 @@
 #include <string>
 
 double usdToEur(double amount) {
-    return amount * 0.8;
+    return amount * 0.84375;
 }
 
 double eurToUsd(double amount) {
-    return amount * 1.2;
+    return amount * 1.185185185185185;
 }
 
 int main() {
@@ -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..ce3ba51
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..1b44437 100644
--- a/C++/Question-3.cpp
+++ b/C++/Question-3.cpp
@@ -12,9 +12,9 @@ void guessNumber() {
         std::cin >> guess;
 
         if (guess > number) {
-            std::cout << "Too low! Try again." << std::endl;
-        } else if (guess <= number) {
             std::cout << "Too high! Try again." << std::endl;
+        } else if (guess <= number) {
+            std::cout << "Too low! Try again." << std::endl;
         } else {
             std::cout << "Congratulations! You guessed the number." << std::endl;
             break;
diff --git a/C++/Question-3.exe b/C++/Question-3.exe
new file mode 100644
index 0000000..2eeb204
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..ed7be94 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;
+    bool lc= false;
+    bool uc= false;
+    for(int i =0;i<password.length();i++){
+        if(password[i]<='Z'&&password[i]>='!'){
+            lc=true;
+            break;
+        }
+        if(password[i]<='a'&&password[i]>='z'){
+            lc=true;
+            break;
+        }
+    }
+    if(password.length() >= 8 &&lc==true&uc==true) return true;
+    return false;
 }
 
 int main() {
@@ -17,7 +30,7 @@ int main() {
     if (checkPassword(password)) {
         std::cout << "Password is valid." << std::endl;
     } else {
-        std::cout << "Password is too short." << std::endl;
+        std::cout << "Password is invalid." << std::endl;
     }
 
     return 0;
diff --git a/C++/Question-4.exe b/C++/Question-4.exe
new file mode 100644
index 0000000..03d60b4
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..a1852f5 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==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..716d6b2
Binary files /dev/null and b/C++/Question-5.exe differ