How can I complete the program execution process if the file specified for the input stream does not exist?

1 answer 1

Exit the main function using the return . File availability can be checked by:

 int main() { FILE *fo = fopen("Путь к файлу", "r"); // Файла нет if (fo == 0) { return 1; } ... }
  • Technically, an error at this stage means rather that the file cannot be read. It may exist, just be unavailable. Although there are very few tasks where distinguishing these situations is important. - D-side
  • @ D-side But how can you tell when it does not exist, and when it is not available? - nikita
  • @ nikita is portable - no way. The OS may deliberately provide this illusion. - D-side
  • one
    @ nikita, if we use fopen , then we most likely mean that we execute the program in POSIX . And there is a global variable errno (available via #include <errno.h> ). If it is ENOENT , then there is no such file. (all its relevant values ​​can be found in man 2 open ) - avp
  • Yet return 0; , somehow not good, because 0 is the code for the normal completion of the process. - avp pm