Compilare: main.cpp: In function 'int main()': main.cpp:12:10: warning: statement has no effect [-Wunused-value] cr[1]==1; ~~~~~^~~ main.cpp:13:10: warning: statement has no effect [-Wunused-value] cr[0]==1; ~~~~~^~~ main.cpp:15:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (cr[i]==0) for (j=2;j*i<=n;j++) cr[i*j]=1; ~~~^~~ main.cpp:16:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=2;i<=n;i++) if (cr[i]==0) v[++k]=i; ~^~~ main.cpp:17:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=2;i<=n;i++) ~^~~