Compilare: user.cpp: In function ‘int main()’: user.cpp:19:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < text.length(); i++) ^ user.cpp:16:16: warning: unused variable ‘mod’ [-Wunused-variable] char last, mod; ^ user.cpp:12:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("compress.in", "r", stdin); ^ user.cpp:13:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("compress.out", "w", stdout); ^ user.cpp:21:9: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(text[i] != last) ^