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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4.  
  5. char * alpha = "abcdefghijklmnopqrstuvwxyz";
  6. char * bigAl = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
  7. char * digit = "0123456789";
  8.  
  9. int main (void)
  10. {
  11.     char y = 0;
  12.     char syms[128] = {0};
  13.     int found = 0;
  14.     char passw[5] = { 0 };
  15.     char guess[5] = { 0 };
  16.  
  17.     printf("Will you use characters (y/n): ");
  18.     scanf(" %c", &y);
  19.     if (y=='y') strcat(syms,alpha);
  20.  
  21.     printf("Will you use big characters (y/n): ");
  22.     scanf(" %c", &y);
  23.     if (y=='y') strcat(syms,bigAl);
  24.  
  25.     printf("Will you use numbers (y/n): ");
  26.     scanf(" %c", &y);
  27.     if (y=='y') strcat(syms,digit);
  28.  
  29.     if (strlen(syms))
  30.     {
  31.         printf("Enter your password: ");
  32.         scanf("%4s", passw);
  33.         for(char * c = syms; !found && *c; ++c)
  34.         {
  35.             guess[0] = *c;
  36.             guess[1] = 0;
  37.             if (strcmp(guess,passw) == 0)
  38.             {
  39.                 found = 1; break;
  40.             }
  41.             for(char * c1 = syms; !found && *c1; ++c1)
  42.             {
  43.                 guess[1] = *c1;
  44.                 guess[2] = 0;
  45.                 if (strcmp(guess,passw) == 0)
  46.                 {
  47.                     found = 1; break;
  48.                 }
  49.                 for(char * c2 = syms; !found && *c2; ++c2)
  50.                 {
  51.                     guess[2] = *c2;
  52.                     guess[3] = 0;
  53.                     if (strcmp(guess,passw) == 0)
  54.                     {
  55.                         found = 1; break;
  56.                     }
  57.                     for(char * c3 = syms; !found && *c3; ++c3)
  58.                     {
  59.                         guess[3] = *c3;
  60.                         if (strcmp(guess,passw) == 0)
  61.                         {
  62.                             found = 1; break;
  63.                         }
  64.                     }
  65.                 }
  66.             }
  67.         }
  68.     }
  69.     printf("Password = [%s]\n",(found) ? guess : "NOT FOUND");
  70.     printf("done.\n");
  71.  
  72.     return EXIT_SUCCESS;
  73. }
  74.  
  75.  
Success #stdin #stdout 0s 2172KB
comments (?)
stdin
copy 
y
y
n
aZZZ
stdout
copy 
Will you use characters (y/n): Will you use big characters (y/n): Will you use numbers (y/n): Enter your password: Password = [aZZZ]
done.
https://ideone.com/4xHyu2
language:
C (gcc 8.3)
created:
9 years ago
visibility:
public

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