Added Program to automatically generate passwords

autoPasswordGenerator.cpp

@@ -0,0 +1,77 @@
+// Random Password Generator Using String
+// A program that generates a random password of min length 6 and
+// max length 12 automatically, that has all fields checked
+// i.e. has both upper case and lower case letters, numbers
+// and even special characters as a combination
+#include <bits/stdc++.h>
+using namespace std;
+
+// Function to generate random password string
+string gen_random()
+{
+    // to change random value with time
+    srand(time(0));
+    int minlen = 6, maxlen = 12;
+    // length to be used
+    int uselen = (rand() % (maxlen - minlen + 1)) + minlen;
+
+    string s;
+    // all characters that can form the password
+    string alphanum =
+        "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz@!,.*;";
+
+    for (int i = 0; i < uselen; ++i)
+    {
+        s += alphanum[rand() % (alphanum.length() - 1)];
+    }
+    // returning the string formed
+    return s;
+}
+
+// boolean function to check if the automatically generated password string
+// passes all fields of being an accepted password
+bool checkPass(string str)
+{
+    int n = str.length(), fu = -1, fs = -1, fn = -1;
+
+    // Check for upper case character
+    for (int i = 0; i < n; i++)
+    {
+        if (isupper(str[i]))
+        {
+            fu = 1;
+        }
+
+        // Check for special character
+        if (str[i] == '@' or str[i] == '!' or str[i] == ',' or str[i] == '.' or str[i] == '*' or str[i] == ';')
+        {
+            fs = 1;
+        }
+
+        // Check for number
+        if (str[i] - '0' >= 0 and str[i] - '0' <= 9)
+        {
+            fn = 1;
+        }
+    }
+    // If all conditions true, return true else return false
+    if (fu == 1 and fs == 1 and fn == 1)
+        return true;
+    else
+        return false;
+}
+
+// Main method
+int main()
+{
+    string str = gen_random();
+
+    // Keep on generating password strings, until all checks have not passed
+    while (!checkPass(str))
+    {
+        str = gen_random();
+    }
+    // Printing random password generated
+    cout << "Automatically Generated Random Password : " << str << endl;
+    return 0;
+}