10. Проверка формата файла
int main(int argc, char *argv[])
{
int len;
char *name_file;
char *out_file;
FILE *fin;
name_file = argv[1];
if (strcmp(strchr(name_file, '.'), ".txt") != 0)
{
printf("Error 2.Can not open file because bad format.\n");
return 1;
}
// do smth
return 0;
}
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