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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4. #include <ctype.h>
  5.  
  6. typedef struct _TAddress
  7. {   char IPclass;
  8.     int a[4];
  9.     int freeBits;
  10.     int Nbits;
  11.     int Mbits;
  12. }   TAddress;
  13.  
  14. void FillPow2 (int pow2[])
  15. {   int i = 0;
  16.     pow2[0] = 1;
  17.     while (++i<25)
  18.         pow2[i] = pow2[i-1]*2;
  19. }
  20.  
  21. int IsClass (char c)
  22. {   char *alphabet = "ABC";
  23.     int i = strlen(alphabet);
  24.     while (--i >-1)
  25.         if (c == alphabet[i])
  26.             return 1;
  27.     return 0;
  28. }
  29.  
  30. TAddress *CreateAddress (char cl)
  31. {   TAddress *address = (TAddress*) malloc (sizeof(TAddress));
  32.     address->IPclass = cl;
  33.     address->a[0] = 255;
  34.     address->a[1] = address->a[2] = address->a[3] = 0;
  35.  
  36.     if (cl == 'A')
  37.         address->freeBits = 24;
  38.     else
  39.     {   address->a[1] = 255;
  40.         if (cl == 'B')
  41.             address->freeBits = 16;
  42.         else
  43.         {   address->a[2] = 255;
  44.             address->freeBits = 8;
  45.         }
  46.     }
  47.     address->Mbits = address->Nbits = -1;
  48.  
  49.     return address;
  50. }
  51.  
  52. void DeleteAddress (TAddress *address)
  53. {   free (address);
  54. }
  55.  
  56. void PrintAddress (TAddress *address)
  57. {   int i;
  58.     for (i = 0; i<4; i++)
  59.         printf("%3d.", address->a[i]);
  60.     printf("\n");
  61. }
  62.  
  63. void FillBits (TAddress *address, int N, int M, int pow2[])
  64. {   int i;
  65.     if (N)
  66.     {   for (i = 0; i<25; i++)
  67.             if (N <= pow2[i]-2)
  68.             {   address->Nbits = i;
  69.                 break;
  70.             }
  71.         for (i = 0; i<25; i++)
  72.             if (M <= pow2[i]-2)
  73.             {   address->Mbits = i;
  74.                 break;
  75.             }
  76.     }
  77.     else
  78.     {   address->Nbits = 0;
  79.         address->Mbits = address->freeBits;
  80.     }
  81. }
  82.  
  83. int CheckBits (TAddress *address)
  84. {   return address->Nbits + address->Mbits <= address->freeBits && address->Nbits>=0 && address->Mbits>0;
  85. }
  86.  
  87. int ai (int pow2[], int bits)
  88. {   int i = 0, sum = pow2[7];
  89.     while (++i < bits)
  90.         sum += pow2[7-i];
  91.     return sum;
  92. }
  93.  
  94. void CreateMask (TAddress *address, int pow2[])
  95. {   if (!address->Nbits)
  96.         return;
  97.     if (address->IPclass == 'C')
  98.     {   address->a[3] = ai(pow2, address->Nbits);
  99.         return;
  100.     }
  101.     if (address->IPclass == 'B')
  102.     {   if (address->Nbits <= 8)
  103.         {   address->a[2] = ai(pow2, address->Nbits);
  104.             return;
  105.         }
  106.         else
  107.         {   address->a[2] = 255;
  108.             address->a[3] = ai(pow2, address->Nbits-8);
  109.             return;
  110.         }
  111.     }
  112.     if (address->Nbits <= 8)
  113.     {   address->a[1] = ai(pow2, address->Nbits);
  114.         return;
  115.     }
  116.     else if (address->Nbits <= 16)
  117.     {   address->a[1] = 255;
  118.         address->a[2] = ai(pow2, address->Nbits-8);
  119.         return;
  120.     }
  121.     else
  122.     {   address->a[1] = address->a[2] = 255;
  123.         address->a[3] = ai(pow2, address->Nbits-16);
  124.         return;
  125.     }
  126. }
  127.  
  128.  
  129. int main()
  130. {
  131.     flag:
  132.     setlocale(0,"Russian");
  133.     int pow2[25], N, M;
  134.     FillPow2 (pow2);
  135.     char cl;
  136.  
  137.     do
  138.     {   printf("Класс:\t");
  139.         cl = toupper (getc(stdin));
  140.         getc(stdin);
  141.     } while (!IsClass (cl));
  142.  
  143.     TAddress *address = CreateAddress (cl);
  144.     printf("Стандартная маска в классе:\t");
  145.     PrintAddress (address);
  146.  
  147.     printf("\n\nКоличество подсетей N = ");
  148.     scanf ("%d", &N);
  149.     printf("Максимальное количество ПК в подсети M = ");
  150.     scanf ("%d", &M);
  151.     getc(stdin);
  152.  
  153.     FillBits (address, N, M, pow2);
  154.     printf("Cвободно битов: %d\tБитов под подсети: %d\tБитов под пк: %d", address->freeBits, address->Nbits, address->Mbits);
  155.     if (CheckBits (address))
  156.     {   CreateMask (address, pow2);
  157.         printf("\n\nКонфигурация маски:\t");
  158.         PrintAddress (address);
  159.     }
  160.     else
  161.         printf("\n\nНевозможно создать в данной конфигурации.\n");
  162.  
  163.     DeleteAddress (address);
  164.     getchar();
  165.     goto flag;
  166.     return 0;
  167. }
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
copy 
Standard input is empty
compilation info 
prog.cpp: In function ‘int IsClass(char)’:
prog.cpp:22:22: warning: ISO C++ forbids converting a string constant to ‘char*’ [-Wwrite-strings]
 {   char *alphabet = "ABC";
                      ^~~~~
prog.cpp: In function ‘int main()’:
prog.cpp:132:26: error: ‘setlocale’ was not declared in this scope
     setlocale(0,"Russian");
                          ^
stdout
copy 
Standard output is empty
https://ideone.com/DK5IcS
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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