Compilare: user.cpp: In function ‘int main()’: user.cpp:23:13: warning: unused variable ‘pos’ [-Wunused-variable] int len,pos,pos2; ^ user.cpp:23:17: warning: unused variable ‘pos2’ [-Wunused-variable] int len,pos,pos2; ^ user.cpp:13:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%c",&ch[1]); ^ user.cpp:17:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%c",&ch[n]); ^