Compilare: user.cpp: In function ‘int main()’: user.cpp:21:9: warning: unused variable ‘pos’ [-Wunused-variable] int pos,pos2,xs; ^ user.cpp:21:13: warning: unused variable ‘pos2’ [-Wunused-variable] int pos,pos2,xs; ^ user.cpp:12:28: 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:16:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%c",&ch[n]); ^