Compilare: main.cpp:4:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] main(){ ^ main.cpp: In function 'int main()': main.cpp:5:17: warning: unused variable 'r' [-Wunused-variable] int n,i,x,m=0,r,a,b; ^ main.cpp:11:17: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized] g<<a<<" "<<b<<" "<<m+m; ^~~ main.cpp:11:9: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized] g<<a<<" "<<b<<" "<<m+m; ^~~