Compilare: main.cpp: In function 'int main()': main.cpp:92:12: warning: unused variable 'a' [-Wunused-variable] int x, y, a; ^ main.cpp:122:17: warning: ignoring return value of 'int system(const char*)', declared with attribute warn_unused_result [-Wunused-result] system("pause"); ^ main.cpp:121:26: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized] out << x << ' ' << y << ' ' << A; ^~~ main.cpp:121:14: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized] out << x << ' ' << y << ' ' << A; ^~~