Compilare: main.cpp: In function 'int main()': main.cpp:14:85: warning: 'j' may be used uninitialized in this function [-Wmaybe-uninitialized] return sqrt(1e-5 + (this->x - other.x) * (this->x - other.x) + (this->y - other.y) * (this->y - other.y)); ~~~~~~^ main.cpp:34:9: note: 'j' was declared here int j; ^