Compilare: user.cpp: In function ‘bool compute(char*)’: user.cpp:57:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] nums.push(vals[str[i]]); ^ user.cpp:70:48: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(!ops.empty() && prt[ops.top()]<=prt['&']) ^ user.cpp:76:48: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(!ops.empty() && prt[ops.top()]<=prt['^']) ^ user.cpp:82:48: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(!ops.empty() && prt[ops.top()]<=prt['|']) ^ user.cpp: In function ‘bool same_vars()’: user.cpp:115:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] fa[sa[i]] = 1; ^ user.cpp:118:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] fb[sb[i]] = 1; ^ user.cpp: In function ‘int main()’: user.cpp:177:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d ",&n); ^ user.cpp:179:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%s %s ",sa,sb); ^