Кол-во строк в файле

int main()
\
FILE *f;
int count=0;
char c;

if ((f=fopen("text.txt","r"))==NULL) cout << "couldn't open file!\n";
while (!feof(f)) if ((c=fgetc(f))=='\n' || c==EOF) count++;
fclose(f);
cout << count << endl;
return 0;
/