Compilare: user.cpp: In function ‘void ciur(long long unsigned int)’: user.cpp:16:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 3; i <= n; i+=2) { ^ user.cpp:18:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = i + i + i; j <= n; j += i << 1) { ^ user.cpp:21:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i>=a) ^ user.cpp:15:16: warning: unused variable ‘nr’ [-Wunused-variable] long i, j, nr = 1; ^ user.cpp: In function ‘int main()’: user.cpp:44:28: warning: left operand of comma operator has no effect [-Wunused-value] for(i=poz-1,j=i-1;i>=lim,j>=lim;i--,j--) ^