Compilare: user.cpp: In function ‘int main()’: user.cpp:6:21: warning: unused variable ‘flag’ [-Wunused-variable] int i,j,n,x,con,flag,d,nr; ^ user.cpp:6:26: warning: unused variable ‘d’ [-Wunused-variable] int i,j,n,x,con,flag,d,nr; ^ user.cpp:6:28: warning: unused variable ‘nr’ [-Wunused-variable] int i,j,n,x,con,flag,d,nr; ^ user.cpp:9:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d " ,&n); ^ user.cpp:11:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%c" ,&v[i]); ^