secvreg.cpp: In function 'int main()': secvreg.cpp:18: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result secvreg.cpp:19: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result secvreg.cpp:20: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result secvreg.cpp:39: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result secvreg.cpp:41: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result