mindig csak a tanulás 2. ZH

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

int main(int argc, char *argv[])
{
FILE *f;
f=fopen(argv[1],"r");

int i=0,db=0,volt_i=0,elso_jel=0;
char c,nev[41];
while(c=fgetc(f))
{
        if(c==';')
           {
           c=fgetc(f);
           if(c=='I')
                volt_i=1;
           }

        if(c=='\n' || c==EOF){
           if(volt_i == 1)
                {
                db++;
                volt_i=0;
                }
}if(c==EOF)
    break;}
printf("%d\n",db);
rewind(f);
while(c=fgetc(f) )
{
        if(c!=';' && elso_jel == 0)
           nev[i++]=c;

        if(c==';')
           {
           elso_jel=1;
           c=fgetc(f);
           if(c=='I')
                volt_i=1;
           }

       if(c=='\n' || c==EOF )
           {
           if(volt_i == 1)
                {
                nev[i]='\0';
                printf("%s\n",nev);
                }
           volt_i=0;
           i=0;
           elso_jel=0;
           }
if(c==EOF)
    break;
}
fclose(f);
return 0;
}