Compilare: main.cpp: In function 'int alcat(int, int)': main.cpp:35:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.cpp: In function 'void ciur()': main.cpp:20:11: warning: iteration 999999 invokes undefined behavior [-Waggressive-loop-optimizations] if(c[i]==0 ){nrprime[++m]=i; } ~~~^ main.cpp:19:10: note: within this loop for(i=1;i<=1000000;i++){ ~^~~~~~~~~