ecuatii.cpp: In function 'int main()': ecuatii.cpp:108: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result ecuatii.cpp:109: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result ecuatii.cpp:111: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result ecuatii.cpp:114: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result /tmp/ccPlJphw.o: In function `main': ecuatii.cpp:(.text+0x3db): warning: the `gets' function is dangerous and should not be used.