Compilare: user.cpp: In function ‘char nextch()’: user.cpp:14:31: 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); ^ user.cpp: In function ‘int main()’: user.cpp:70:9: warning: ‘con’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(con>0) ^