factk.cpp: In function 'int main()': factk.cpp:47: warning: format '%d' expects type 'int', but argument 2 has type 'long long int' factk.cpp:28: warning: unused variable 'ex' factk.cpp:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result factk.cpp:30: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result factk.cpp:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result