// A C/C++ Program to generate OTP (One Time Password) #include   using namespace std; // A Function to generate a unique OTP everytime string generateOTP(int len) {  // All possible characters of my OTP  string str = 'abcdefghijklmnopqrstuvwxyzABCD'  'EFGHIJKLMNOPQRSTUVWXYZ0123456789';  int n = str.length();  // String to hold my OTP  string OTP;  for (int i=1; i<=len; i++)  OTP.push_back(str[rand() % n]);  return(OTP); } // Driver Program to test above functions int main() {  // For different values each time we run the code  srand(time(NULL));  // Declare the length of OTP  int len = 6;  printf('Your OTP is - %s' generateOTP(len).c_str());  return(0); } 

// A Java Program to generate OTP (One Time Password) class GFG{ // A Function to generate a unique OTP everytime static String generateOTP(int len) {  // All possible characters of my OTP  String str = 'abcdefghijklmnopqrstuvwxyzABCD'  +'EFGHIJKLMNOPQRSTUVWXYZ0123456789';  int n = str.length();  // String to hold my OTP  String OTP='';  for (int i = 1; i <= len; i++)  OTP += (str.charAt((int) ((Math.random()*10) % n)));  return(OTP); } // Driver code public static void main(String[] args) {  // Declare the length of OTP  int len = 6;  System.out.printf('Your OTP is - %s' generateOTP(len)); } } // This code is contributed by PrinciRaj1992 

# A Python3 Program to generate OTP (One Time Password) import random # A Function to generate a unique OTP everytime def generateOTP(length): # All possible characters of my OTP str = 'abcdefghijklmnopqrstuvwxyzAB  CDEFGHIJKLMNOPQRSTUVWXYZ0123456789'; n = len(str); # String to hold my OTP OTP = ''; for i in range(1length+1): OTP += str[int(random.random()*10) % n]; return (OTP); # Driver code if __name__ == '__main__': # Declare the length of OTP length = 6; print('Your OTP is - ' generateOTP(length)); # This code contributed by Rajput-Ji 

// A C# Program to generate OTP (One Time Password) using System; class GFG {  // A Function to generate a unique OTP everytime  static string generateOTP(int len)  {  // All possible characters of my OTP  string str = 'abcdefghijklmnopqrstuvwxyzABCD'  + 'EFGHIJKLMNOPQRSTUVWXYZ0123456789';  int n = str.Length;  // Creating a new Random object  Random rand = new Random();  // String to hold my OTP  string OTP = '';  for (int i = 1; i <= len; i++)  OTP += (str[((int)((rand.Next() * 10) % n))]);  return (OTP);  }  // Driver code  public static void Main(string[] args)  {  // Declare the length of OTP  int len = 6;  Console.WriteLine('Your OTP is - '  + generateOTP(len));  } } // This code is contributed by phasing17 

// JavaScript Program to generate OTP (One Time Password) // A Function to generate a unique OTP everytime function generateOTP(length) {  // All possible characters of my OTP  let str = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';  let n = str.length;  // String to hold my OTP  let OTP = '';  for (var i = 1; i <= length; i++)  OTP += str[(Math.floor(Math.random() * 10) % n)];  return (OTP); } // Driver code // Declare the length of OTP let length = 6; console.log('Your OTP is - ' generateOTP(length)); // This code is contributed by phasing17