missinglines.c

#include<stdio.h>
#include<string.h>
#include<limits.h>
#include<conio.h>

int main()
{
    FILE *A;
    FILE *B;
    char* linia1;
    char* linia2;
    int dlugosc;
    int znaleziono;

    if ((A = fopen("plikA.txt", "rt"))
       == NULL)
   {
      fprintf(stderr, "Cannot open input file.\n");
      return 1;
   }
   if ((B = fopen("plikB.txt", "rt"))
       == NULL)
   {
      fprintf(stderr, "Cannot open input file.\n");
      return 1;
   }
   while(!feof(A))
    {
        znaleziono=0;
        fgets(linia1,INT_MAX,A);
        dlugosc=strlen(linia1)-strlen(strstr(linia1,"("));
        fseek(B,0L,SEEK_SET);
       while(!feof(B))
       {
           fgets(linia2,INT_MAX,B);
           if(!strncmp(linia2,linia1,dlugosc)) znaleziono=1;
       }
        if(!znaleziono) printf("%s\n",linia1);
       puts(linia1);
   }


   fclose(A);
   fclose(B);



    return 0;
}