Compilare: user.cpp: In function ‘void ciur()’: user.cpp:18:26: warning: operation on ‘nr’ may be undefined [-Wsequence-point] x[++nr]=x[nr-1]+1; ^ user.cpp:22:28: warning: operation on ‘nr’ may be undefined [-Wsequence-point] else x[++nr]=x[nr-1]; ^ user.cpp: In function ‘int main()’: user.cpp:28:15: warning: unused variable ‘c’ [-Wunused-variable] int a , b,c,d; ^ user.cpp:28:17: warning: unused variable ‘d’ [-Wunused-variable] int a , b,c,d; ^