Eroare de compilare: user.cpp:6:14: error: ‘double y1’ redeclared as different kind of symbol double x2,x1,y1,y2,s,x,y; ^ In file included from /usr/include/features.h:357:0, from /usr/include/assert.h:37, from /usr/include/c++/4.8/cassert:43, from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:33, from user.cpp:1: /usr/include/i386-linux-gnu/bits/mathcalls.h:243:1: error: previous declaration of ‘double y1(double)’ __MATHCALL (y1,, (_Mdouble_)); ^ user.cpp: In function ‘int main()’: user.cpp:13:7: error: assignment of function ‘double y1(double)’ y1=y; ^ user.cpp:13:7: error: cannot convert ‘double’ to ‘double(double)throw ()’ in assignment user.cpp:16:26: error: invalid operands of types ‘double’ and ‘double(double)throw ()’ to binary ‘operator*’ s+=0.5*(x1*y2-x2*y1); ^ user.cpp:18:11: error: assignment of function ‘double y1(double)’ y1=y2; ^ user.cpp:18:11: error: cannot convert ‘double’ to ‘double(double)throw ()’ in assignment user.cpp:8:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("aria.in","r",stdin); ^ user.cpp:9:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("aria.out","w",stdout); ^