Eroare de compilare: main.cpp: In function 'double abs(double)': main.cpp:9:20: error: 'double abs(double)' conflicts with a previous declaration double abs(double a) ^ In file included from /usr/include/c++/6/math.h:36:0, from main.cpp:3: /usr/include/c++/6/cmath:85:3: note: previous declaration 'constexpr double std::abs(double)' abs(double __x) ^~~ main.cpp: In function 'bool grad2(std::__cxx11::string)': main.cpp:58:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < s.size() ; i++) ~~^~~~~~~~~~ main.cpp: In function 'bool e_intreg(double)': main.cpp:69:14: error: call of overloaded 'abs(double&)' is ambiguous a = abs(a); ^ In file included from /usr/include/c++/6/cstdlib:75:0, from /usr/include/c++/6/ext/string_conversions.h:41, from /usr/include/c++/6/bits/basic_string.h:5420, from /usr/include/c++/6/string:52, from /usr/include/c++/6/bits/locale_classes.h:40, from /usr/include/c++/6/bits/ios_base.h:41, from /usr/include/c++/6/ios:42, from /usr/include/c++/6/istream:38, from /usr/include/c++/6/fstream:38, from main.cpp:1: /usr/include/stdlib.h:774:12: note: candidate: int abs(int) extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur; ^~~ In file included from /usr/include/c++/6/math.h:36:0, from main.cpp:3: /usr/include/c++/6/cmath:95:3: note: candidate: constexpr long double std::abs(long double) abs(long double __x) ^~~ /usr/include/c++/6/cmath:91:3: note: candidate: constexpr float std::abs(float) abs(float __x) ^~~ /usr/include/c++/6/cmath:85:3: note: candidate: constexpr double std::abs(double) abs(double __x) ^~~ In file included from /usr/include/c++/6/ext/string_conversions.h:41:0, from /usr/include/c++/6/bits/basic_string.h:5420, from /usr/include/c++/6/string:52, from /usr/include/c++/6/bits/locale_classes.h:40, from /usr/include/c++/6/bits/ios_base.h:41, from /usr/include/c++/6/ios:42, from /usr/include/c++/6/istream:38, from /usr/include/c++/6/fstream:38, from main.cpp:1: Non zero exit status: 1