Eroare de compilare: user.cpp:16:16: error: ‘double y1’ redeclared as different kind of symbol double x1, x2, y1, y2, r; ^ In file included from /usr/include/features.h:367:0, from /usr/include/x86_64-linux-gnu/c++/5/32/bits/os_defines.h:39, from /usr/include/x86_64-linux-gnu/c++/5/32/bits/c++config.h:482, from /usr/include/c++/5/utility:68, from /usr/include/c++/5/algorithm:60, from user.cpp:1: /usr/include/bits/mathcalls.h:251:1: note: previous declaration ‘double y1(double)’ __MATHCALL (y1,, (_Mdouble_)); ^ user.cpp: In function ‘void get_data()’: user.cpp:23:21: error: invalid operands of types ‘double(double) throw ()’ and ‘double’ to binary ‘operator+’ double y3 = (y1 + y2) / 2; ^ user.cpp:24:52: error: invalid operands of types ‘double’ and ‘double(double) throw ()’ to binary ‘operator-’ double dist = sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1)); ^ user.cpp:24:64: error: invalid operands of types ‘double’ and ‘double(double) throw ()’ to binary ‘operator-’ double dist = sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1)); ^ user.cpp:27:28: error: invalid operands of types ‘double(double) throw ()’ and ‘double’ to binary ‘operator-’ double tx = term * (y1 - y2) / dist; ^ user.cpp: In function ‘void solve(int)’: user.cpp:44:14: error: no match for ‘operator>>’ (operand types are ‘std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}’ and ‘double(double) throw ()’) in >> x1 >> y1 >> x2 >> y2; ^ In file included from /usr/include/c++/5/iostream:40:0, from user.cpp:2: /usr/include/c++/5/istream:120:7: note: candidate: std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(std::basic_istream<_CharT, _Traits>::__istream_type& (*)(std::basic_istream<_CharT, _Traits>::__istream_type&)) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>] <near match> operator>>(__istream_type& (*__pf)(__istream_type&)) ^ /usr/include/c++/5/istream:120:7: note: conversion of argument 1 would be ill-formed: user.cpp:44:17: error: invalid conversion from ‘double (*)(double) throw ()’ to ‘std::basic_istream<char>::__istream_type& (*)(std::basic_istream<char>::__istream_type&) {aka std::basic_istream<char>& (*)(std::basic_istream<char>&)}’ [-fpermissive] in >> x1 >> y1 >> x2 >> y2; ^ In file included from /usr/include/c++/5/iostream:40:0, from user.cpp:2: /usr/include/c++/5/istream:124:7: note: candidate: std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(std::basic_istream<_CharT, _Traits>::__ios_type& (*)(std::basic_istream<_CharT, _Traits>::__ios_type&)) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>; std::basic_istream<_CharT, _Traits>::__ios_type = std::basic_ios<char>] <near match> operator>>(__ios_type& (*__pf)(__ios_type&)) ^ /usr/include/c++/5/istream:124:7: note: conversion of argument 1 would be ill-formed: user.cpp:44:17: error: invalid conversion from ‘double (*)(double) throw ()’ to ‘std::basic_istream<char>::__ios_type& (*)(std::basic_istream<char>::__ios_type&) {aka std::basic_ios<char>& (*)(std::basic_ios<char>&)}’ [-fpermissive] in >> x1 >> y1 >> x2 >> y2; ^ In file included from /usr/include/c++/5/iostream:40:0, from user.cpp:2: /usr/include/c++/5/istream:131:7: note: candidate: std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(std::ios_base& (*)(std::ios_base&)) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>] <near match>