Compilare: user.cpp: In function ‘int main()’: user.cpp:56:18: warning: unused variable ‘j’ [-Wunused-variable] int n,maxl,i,j,l,con,nod,val; ^ user.cpp:56:20: warning: unused variable ‘l’ [-Wunused-variable] int n,maxl,i,j,l,con,nod,val; ^ user.cpp:56:22: warning: unused variable ‘con’ [-Wunused-variable] int n,maxl,i,j,l,con,nod,val; ^ user.cpp:56:26: warning: unused variable ‘nod’ [-Wunused-variable] int n,maxl,i,j,l,con,nod,val; ^ user.cpp:56:30: warning: unused variable ‘val’ [-Wunused-variable] int n,maxl,i,j,l,con,nod,val; ^ user.cpp:57:10: warning: unused variable ‘aux’ [-Wunused-variable] char aux; ^ user.cpp: In function ‘char nextch()’: user.cpp:17:31: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf,1,MAXBUF,fi); ^