SO062

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/wait.h>

bool lpierwsza(int liczba){
for(int i=2;i*i<=liczba;i++){
if(liczba%i==0)
	return false;
}
return true;
}
int main()
{
char buff[10];
      int rd;
      int i, k;
      int f = fork();

      int file1 = open("tmp1.txt", O_CREAT | O_RDWR | O_TRUNC);
      int file2 = open("tmp2.txt", O_CREAT | O_RDWR | O_TRUNC);

      if(file1 == -1 || file2 == -1)
      {
          printf("Blad podczas odczytu pliku\n");
          return 0;
      }
      if(f > 0){
          i = 1;
          k = 99;
      }
      else{
        i = 100;
        k = 200;
    }

    for(i; i <= k; i++){
        if(lpierwsza(i)){
            sprintf(buff, "%d\n", i);
            if(f > 0){
                write(file1, buff, sizeof(buff));
            }
            else{
                write(file2, buff, sizeof(buff));
            }
        }
    }
    wait(NULL);
    lseek(file1, 0, SEEK_SET);
    lseek(file2, 0, SEEK_SET);

    while((rd = read(file1, buff, sizeof(buff))) > 0){
        printf("%s", buf);
    }
    while((rd = read(file2, buff, sizeof(buff))) > 0){
        printf("%s", buf);
    }
    close(file1);
    close(file2);
    return 0;
}