Eroare de compilare: user.cpp:4:12: error: ‘double y1’ redeclared as different kind of symbol double x1, y1, x2, y2; ^ In file included from /usr/include/features.h:346:0, from /usr/local/include/c++/4.8.0/i686-pc-linux-gnu/bits/os_defines.h:39, from /usr/local/include/c++/4.8.0/i686-pc-linux-gnu/bits/c++config.h:420, from /usr/local/include/c++/4.8.0/cstdio:41, from user.cpp:1: /usr/include/bits/mathcalls.h:242:1: error: previous declaration of ‘double y1(double)’ __MATHCALL (y1,, (_Mdouble_)); ^ user.cpp: In function ‘int main()’: user.cpp:11:42: warning: format ‘%lf’ expects argument of type ‘double*’, but argument 3 has type ‘double (*)(double)throw ()’ [-Wformat=] scanf("%lf%lf%lf%lf", &x1, &y1, &x2, &y2); ^ user.cpp:12:35: error: invalid operands of types ‘double’ and ‘double(double)throw ()’ to binary ‘operator/’ double alpha = min(x2 / x1, y2 / y1); ^