Program to check Strength of Password Last Updated : 19 Aug, 2024 Comments Improve Suggest changes Like Article Like Report A password is said to be strong if it satisfies the following criteria: It contains at least one lowercase English character.It contains at least one uppercase English character.It contains at least one special character. The special characters are: !@#$%^&*()-+Its length is at least 8.It contains at least one digit.Given a string, find its strength. Let a strong password is one that satisfies all above conditions. A moderate password is one that satisfies first three conditions and has length at least 6. Otherwise password is weak.Examples : Input : "GeeksforGeeks!@12"Output : StrongInput : "gfg!@12"Output : ModerateImplementation: C++ // C++ program to check if a given password is // strong or not. #include <bits/stdc++.h> using namespace std; void printStrongNess(string& input) { int n = input.length(); // Checking lower alphabet in string bool hasLower = false, hasUpper = false; bool hasDigit = false, specialChar = false; string normalChars = "abcdefghijklmnopqrstu" "vwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890 "; for (int i = 0; i < n; i++) { if (islower(input[i])) hasLower = true; if (isupper(input[i])) hasUpper = true; if (isdigit(input[i])) hasDigit = true; size_t special = input.find_first_not_of(normalChars); if (special != string::npos) specialChar = true; } // Strength of password cout << "Strength of password:-"; if (hasLower && hasUpper && hasDigit && specialChar && (n >= 8)) cout << "Strong" << endl; else if ((hasLower || hasUpper) && specialChar && (n >= 6)) cout << "Moderate" << endl; else cout << "Weak" << endl; } // Driver code int main() { string input = "GeeksforGeeks!@12"; printStrongNess(input); return 0; } Java // Java implementation for the above approach import java.io.*; import java.util.*; class GFG { public static void printStrongNess(String input) { // Checking lower alphabet in string int n = input.length(); boolean hasLower = false, hasUpper = false, hasDigit = false, specialChar = false; Set<Character> set = new HashSet<Character>( Arrays.asList('!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '-', '+')); for (char i : input.toCharArray()) { if (Character.isLowerCase(i)) hasLower = true; if (Character.isUpperCase(i)) hasUpper = true; if (Character.isDigit(i)) hasDigit = true; if (set.contains(i)) specialChar = true; } // Strength of password System.out.print("Strength of password:- "); if (hasDigit && hasLower && hasUpper && specialChar && (n >= 8)) System.out.print(" Strong"); else if ((hasLower || hasUpper || specialChar) && (n >= 6)) System.out.print(" Moderate"); else System.out.print(" Weak"); } // Driver Code public static void main(String[] args) { String input = "GeeksforGeeks!@12"; printStrongNess(input); } } // contributed by Ashish Chhabra Python3 # Python3 program to check if a given # password is strong or not. def printStrongNess(input_string): n = len(input_string) # Checking lower alphabet in string hasLower = False hasUpper = False hasDigit = False specialChar = False normalChars = "abcdefghijklmnopqrstu" "vwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890 " for i in range(n): if input_string[i].islower(): hasLower = True if input_string[i].isupper(): hasUpper = True if input_string[i].isdigit(): hasDigit = True if input_string[i] not in normalChars: specialChar = True # Strength of password print("Strength of password:-", end = "") if (hasLower and hasUpper and hasDigit and specialChar and n >= 8): print("Strong") elif ((hasLower or hasUpper) and specialChar and n >= 6): print("Moderate") else: print("Weak") # Driver code if __name__=="__main__": input_string = "GeeksforGeeks!@12" printStrongNess(input_string) # This code is contributed by Yash_R C# // C# program for the above approach using System; using System.Collections.Generic; using System.Linq; class GFG { public static void PrintStrongNess(string input) { // Checking lower alphabet in string int n = input.Length; bool hasLower = false, hasUpper = false, hasDigit = false, specialChar = false; HashSet<char> set = new HashSet<char>( new char[] { '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '-', '+' }); foreach (char i in input.ToCharArray()) { if (char.IsLower(i)) hasLower = true; if (char.IsUpper(i)) hasUpper = true; if (char.IsDigit(i)) hasDigit = true; if (set.Contains(i)) specialChar = true; } // Strength of password Console.Write("Strength of password:- "); if (hasDigit && hasLower && hasUpper && specialChar && (n >= 8)) Console.Write(" Strong"); else if ((hasLower || hasUpper || specialChar) && (n >= 6)) Console.Write(" Moderate"); else Console.Write(" Weak"); } // Driver Code public static void Main(string[] args) { string input = "GeeksforGeeks!@12"; PrintStrongNess(input); } } // This code is contributed by Prince Kumar JavaScript // Javascript program for the above approach function printStrongNess(input_string) { const n = input_string.length; // Checking lower alphabet in string let hasLower = false; let hasUpper = false; let hasDigit = false; let specialChar = false; const normalChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890 "; for (let i = 0; i < n; i++) { if (input_string[i] >= "a" && input_string[i] <= "z") { hasLower = true; } if (input_string[i] >= "A" && input_string[i] <= "Z") { hasUpper = true; } if (input_string[i] >= "0" && input_string[i] <= "9") { hasDigit = true; } if (!normalChars.includes(input_string[i])) { specialChar = true; } } // Strength of password let strength = "Weak"; if (hasLower && hasUpper && hasDigit && specialChar && n >= 8) { strength = "Strong"; } else if ((hasLower || hasUpper) && specialChar && n >= 6) { strength = "Moderate"; } console.log(`Strength of password: ${strength}`); } // Driver code const input_string = "GeeksforGeeks!@12"; printStrongNess(input_string); // This code is contributed by princekumaras OutputStrength of password:-StrongTime complexity: O(n)Auxiliary Space: O(1)Take control of your online security today by using GeeksforGeeks Random Password Generator, a reliable tool that makes creating strong passwords a breeze. 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