Programming

#tmp_2
werweraewghe
@tmp_2
123sdfs57a
#tmp_1
aewrgheheghe
@tmp_1
457awrerfa87
#tmp_4
trtyrghe
@tmp_4
8898rtyr2

#tmp_4
#tmp_1

#tmp_4
trtyrghe
@tmp_4
8898rtyr2
#tmp_1
aewrgheheghe
@tmp_1
457awrerfa87

1. Based on the record of reference_file, print out those content that appear in Input_file into another output_file

while read s; do
  while read t; do
    if echo "$t" | grep "${s#\#}"; then
      read q; echo "$q"
    fi
  done <Input_file
done <reference_file
#tmp_4
trtyrghe
@tmp_4
8898rtyr2
#tmp_1
aewrgheheghe
@tmp_1
457awrerfa87

awk 'NR==FNR{sub("#","");a[$0]=1;next}/^#|@/{x=$1;sub("#|@","",x);if (x in a){print;getline;print}}' ref_file in_file

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

int main(int argc, char**argv)
{
    FILE *fh, *fh1, *fout;
    char buf[4096];
    char buf1[4096];

    if (argc != 3)
    {
        printf("Usage: %s <input file> <reference file> <output file>\n", argv[0]);
        return -1;
    }

    if ((fh = fopen(argv[1], "r")) == NULL)
    {
        perror("fopen");
        return -1;
    }
    if ((fh1 = fopen(argv[2], "r")) == NULL)
    {
        perror("fopen");
        return -1;
    }
    if ((fout = fopen(argv[3], "w")) == NULL)
    {
        perror("fopen");
        return -1;
    }


       while(fgets(buf1, sizeof(buf1), fh1))
       {
               if(buf[0]== '#')
               {
                       buf[0]='#';
                       fputs(buf1, fout);
                       if(fgets(buf, sizeof(buf), fh) ) continue;
                       fputs(buf, fout);
               }
       }
       fclose(fh);
       fclose(fh1);
       fclose(fout);
    return 0;


}