Compilare: user.cpp: In function ‘bool intersectie(int, int)’: user.cpp:42:41: warning: variable ‘a1’ set but not used [-Wunused-but-set-variable] int p1x,p1y,p1X,p1Y,p2x,p2y,p2X,p2Y,a1,a2,b1,b2,c1,c2; ^ user.cpp:42:44: warning: variable ‘a2’ set but not used [-Wunused-but-set-variable] int p1x,p1y,p1X,p1Y,p2x,p2y,p2X,p2Y,a1,a2,b1,b2,c1,c2; ^ user.cpp:42:47: warning: variable ‘b1’ set but not used [-Wunused-but-set-variable] int p1x,p1y,p1X,p1Y,p2x,p2y,p2X,p2Y,a1,a2,b1,b2,c1,c2; ^ user.cpp:42:50: warning: variable ‘b2’ set but not used [-Wunused-but-set-variable] int p1x,p1y,p1X,p1Y,p2x,p2y,p2X,p2Y,a1,a2,b1,b2,c1,c2; ^ user.cpp:42:53: warning: variable ‘c1’ set but not used [-Wunused-but-set-variable] int p1x,p1y,p1X,p1Y,p2x,p2y,p2X,p2Y,a1,a2,b1,b2,c1,c2; ^ user.cpp:42:56: warning: variable ‘c2’ set but not used [-Wunused-but-set-variable] int p1x,p1y,p1X,p1Y,p2x,p2y,p2X,p2Y,a1,a2,b1,b2,c1,c2; ^ user.cpp: In function ‘int main()’: user.cpp:82:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("geometry.in","r",stdin); ^ user.cpp:83:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("geometry.out","w",stdout); ^ user.cpp:85:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:88:58: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&a[i].x1,&a[i].y1,&a[i].x2,&a[i].y2); ^