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  1. #include<stdio.h>
  2. #include<string.h>
  3.  
  4. char data[100], concatdata[117], src_crc[17], dest_crc[17], frame[120], divident[18];
  5. char divisor[18];
  6. char res[17] = "0000000000000000";
  7.  
  8. void crc_cal(int node)
  9. {
  10.     int i, j;
  11.     for (j = 17; j <= strlen(concatdata); j++)
  12.     {
  13.         if (divident[0] == '1')
  14.         {
  15.             for (i = 1; i <= 16; i++)
  16.                 if (divident[i] != divisor[i])
  17.                     divident[i - 1] = '1';
  18.                 else
  19.                     divident[i - 1] = '0';
  20.         }
  21.         else
  22.         {
  23.             for (i = 1; i <= 16; i++)
  24.                 divident[i - 1] = divident[i];
  25.         }
  26.         if (node == 0)
  27.             divident[i - 1] = concatdata[j];
  28.         else
  29.             divident[i - 1] = frame[j];
  30.     }
  31.     divident[i] = '\0';
  32.     printf("\ncrc is %s\n", divident);
  33.     if (node == 0)
  34.     {
  35.         strcpy(src_crc, divident);
  36.     }
  37.     else
  38.         strcpy(dest_crc, divident);
  39. }
  40.  
  41. int main()
  42. {
  43.     int i;
  44.     printf("enter the generator bits\n");
  45.     gets(divisor);
  46.     if (strlen(divisor) < 17 || strlen(divisor) > 17)
  47.     {
  48.         printf("please enter the geneartor length min of 17 bits\n");
  49.         exit(0);
  50.     }
  51.     printf("\n At src node :\n Enter the msg to be sent :");
  52.     gets(data);
  53.     strcpy(concatdata, data);
  54.     strcat(concatdata, "0000000000000000");
  55.     for (i = 0; i <= 16; i++)
  56.         divident[i] = concatdata[i];
  57.     divident[i] = '\0';
  58.     crc_cal(0);
  59.     printf("\ndata is:\t");
  60.     puts(data);
  61.     printf("\n The frame transmitted is :\t");
  62.     printf("\n%s%s", data, src_crc);
  63.     printf("\n\t\tSOURCE NODE TRANSMITTED THE FRAME---->");
  64.     printf("\n\n\n\n\t\t\tAT DESTINATION NODE\nenter the recived frame:\t");
  65.     gets(frame);
  66.     for (i = 0; i <= 16; i++)
  67.         divident[i] = frame[i];
  68.     divident[i] = '\0';
  69.     crc_cal(1);
  70.     if ((strcmp(dest_crc, res)) == 0)
  71.         printf("\nRecived frame is error free .\n ");
  72.     else
  73.         printf("\nRecived frame containes one or more error ");
  74.     return 1;
  75. }
  76.  
Success #stdin #stdout 0.01s 5288KB
comments (?)
stdin 
Standard input is empty
stdout 
enter the generator bits
please enter the geneartor length min of 17 bits
https://ideone.com/vglRsL
language:
C (gcc 8.3)
created:
5 days ago
visibility:
public

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