Compilare: user.cpp: In member function ‘bool tipe::operator=(const tipe&)’: user.cpp:20:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<alt.col.size(); i++) ^ user.cpp:24:2: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘void afis(tipe)’: user.cpp:31:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<x.col.size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:51:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d%d",&l,&c,&m); ^ user.cpp:68:21: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&t); ^ user.cpp:69:21: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&p); ^ user.cpp:81:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d%d",&x,&c1,&c2); ^