Compilare: main.cpp: In function 'int main()': main.cpp:14:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(i2=2*i;i2<=1000;i2+=i) ^~~ main.cpp:16:13: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' i2=1; ^~ main.cpp:13:11: warning: iteration 998 invokes undefined behavior [-Waggressive-loop-optimizations] if(v[i]) ~~~^ main.cpp:12:14: note: within this loop for(i=2;i<=1000;i++) ~^~~~~~ main.cpp:11:13: warning: iteration 998 invokes undefined behavior [-Waggressive-loop-optimizations] v[i]=1; ~~~~^~ main.cpp:10:14: note: within this loop for(i=2;i<=1000;i++) ~^~~~~~