numerus.cpp: In function 'int main()': numerus.cpp:7: warning: unused variable 'a' numerus.cpp:7: warning: unused variable 'b' numerus.cpp:7: warning: unused variable 'c' numerus.cpp:7: warning: unused variable 'd' numerus.cpp:7: warning: unused variable 'e' numerus.cpp:5: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result numerus.cpp:6: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result