diff --git a/C++/Question-1.cpp b/C++/Question-1.cpp
index 3373a60..f94ec12 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++) {    //we have to make j=i to j=0
+            if (arr[j] > arr[j + 1]) {  //to make ascending order less than(<) to greater than(>)
                 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..3302a1b
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..6bae6ad 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);// change function name from usdtoEur to eurtoUsd
         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..c578171
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..df5b8c2 100644
--- a/C++/Question-3.cpp
+++ b/C++/Question-3.cpp
@@ -11,9 +11,9 @@ void guessNumber() {
         std::cout << "Guess the number (between 1 and 100): ";
         std::cin >> guess;
 
-        if (guess > number) {
+        if (guess < number) {//changed the greater than(>)to less than(<)
             std::cout << "Too low! Try again." << std::endl;
-        } else if (guess <= number) {
+        } else if (guess > number) {  //changed the less than equal to(<=)to greater than(>)
             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..4a0c8a2
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..948eb53 100644
--- a/C++/Question-4.cpp
+++ b/C++/Question-4.cpp
@@ -5,7 +5,19 @@
 #include <string>
 
 bool checkPassword(std::string password) {
-    return password.length() >= 8;
+    int count1=0,count2 = 0,count3 =0;
+    for(int i=0;i<password.size();i++){
+        if(password[i]>=65&&password[i]<=90){  //check condtion for upper case 
+count1++;
+        }
+        if(password[i]>=97&&password[i]<=122){//check for lower case character
+            count2++;
+        }if(password[i]>=32&&password[i]<=47||password[i]>=58&&password[i]<=64||password[i]>=91&&password[i]<=96||password[i]>=123&&password[i]<=126){
+            count3++;
+        }//check for special character
+        
+    }
+    return password.length() >= 8&&count1>=1&&count2>=1&&count3>=1;
 }
 
 int main() {
@@ -13,11 +25,15 @@ int main() {
 
     std::cout << "Enter a password: ";
     std::getline(std::cin, password);
-
+    if (password.size() < 8)
+    {
+        std::cout<< "Password is too short.";    //check password length condition  when password is short
+    }
+    
     if (checkPassword(password)) {
         std::cout << "Password is valid." << std::endl;
     } else {
-        std::cout << "Password is too short." << std::endl;
+        std::cout << "invalid password" << std::endl;  //check for  uppercase,lowercase as well as special characters
     }
 
     return 0;
diff --git a/C++/Question-4.exe b/C++/Question-4.exe
new file mode 100644
index 0000000..e7a086d
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..425899e 100644
--- a/C++/Question-5.cpp
+++ b/C++/Question-5.cpp
@@ -2,6 +2,13 @@
 
 // Function to calculate the factorial of a number
 int factorial(int n) {
+    
+    if (n == 0 || n == 1)// given base condition for recursion to terminate the function
+    {
+      
+        return 1;
+    }
+    
         return n * factorial(n - 1);
 }
 
@@ -10,9 +17,12 @@ int main() {
     
     std::cout << "Enter a number: ";
     std::cin >> number;
+    if (number < 0) //given condition for negative numbers
+    {
+        std::cout << "Invalid number";
+    }
     
     int result = factorial(number);
-    
     std::cout << "The factorial of " << number << " is " << result << std::endl;
     
     return 0;
diff --git a/C++/Question-5.exe b/C++/Question-5.exe
new file mode 100644
index 0000000..e5d7265
Binary files /dev/null and b/C++/Question-5.exe differ