Compilare: user.cpp: In function ‘int main()’: user.cpp:16:18: warning: ‘xa’ may be used uninitialized in this function [-Wmaybe-uninitialized] int d1=xa*yb + xb*yc + xc*ya - yb*xc - yc*xa - ya*xb; ^ user.cpp:16:18: warning: ‘yb’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:16:26: warning: ‘xb’ may be used uninitialized in this function [-Wmaybe-uninitialized] int d1=xa*yb + xb*yc + xc*ya - yb*xc - yc*xa - ya*xb; ^ user.cpp:16:26: warning: ‘yc’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:16:34: warning: ‘xc’ may be used uninitialized in this function [-Wmaybe-uninitialized] int d1=xa*yb + xb*yc + xc*ya - yb*xc - yc*xa - ya*xb; ^ user.cpp:16:34: warning: ‘ya’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:17:26: warning: ‘yd’ may be used uninitialized in this function [-Wmaybe-uninitialized] int d2=xa*yb + xb*yd + xd*ya - yb*xd - yd*xa - ya*xb; ^ user.cpp:17:34: warning: ‘xd’ may be used uninitialized in this function [-Wmaybe-uninitialized] int d2=xa*yb + xb*yd + xd*ya - yb*xd - yd*xa - ya*xb; ^