ecuatii.cpp: In function 'int main()': ecuatii.cpp:52: warning: unused variable 'num' ecuatii.cpp:50: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result ecuatii.cpp:51: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result ecuatii.cpp:54: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result ecuatii.cpp:57: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result /tmp/cc0uU6ZH.o: In function `main': ecuatii.cpp:(.text+0x1ab): warning: the `gets' function is dangerous and should not be used.