Compilare: user.cpp: In function ‘int main()’: user.cpp:13:20: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&n); ^ user.cpp:17:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&a,&b); ^ user.cpp:38:17: warning: ‘liber’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(where[liber]!=liber && tip[ where[ liber ] ] == 1) ^