Compilare: user.cpp: In function ‘int main()’: user.cpp:74:15: warning: unused variable ‘m’ [-Wunused-variable] int i,j,n,m,p,val,c,max,l,val1,val2; ^ user.cpp:74:19: warning: unused variable ‘val’ [-Wunused-variable] int i,j,n,m,p,val,c,max,l,val1,val2; ^ user.cpp: In function ‘char nextch()’: user.cpp:18:31: 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); ^