Compilare: user.cpp: In function ‘int expresie()’: user.cpp:28: warning: unused variable ‘r1’ user.cpp: In function ‘int factor()’: user.cpp:42: warning: unused variable ‘r1’ user.cpp: In function ‘int main()’: user.cpp:94: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:95: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:97: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result user.cpp:98: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:99: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result /tmp/cc2DgrSm.o: In function `main': user.cpp:(.text+0x2e5): warning: the `gets' function is dangerous and should not be used.