Compilare: main.cpp: In function 'int main()': main.cpp:35:13: warning: unused variable 'x' [-Wunused-variable] int m,i,x,y,n; ^ main.cpp:35:15: warning: unused variable 'y' [-Wunused-variable] int m,i,x,y,n; ^ main.cpp: In function 'int fun(int, int, int, int)': main.cpp:29:1: warning: control reaches end of non-void function [-Wreturn-type] } ^