Eroare de compilare: user.cpp:4:10: error: ‘int y1’ redeclared as different kind of symbol int t,x1,y1,r1,x2,y2,r2,a1,a2,b1,b2; ^ 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:16:26: error: ISO C++ forbids comparison between pointer and integer [-fpermissive] if(x1==x2 && y1==y2 && r1==r2) ^