Compilare: user.cpp: In function ‘int calc(int, int)’: user.cpp:72:53: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(!op.empty() && pr[op.top()]>=pr[stock[x][y][i]]) ^ user.cpp:72:73: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(!op.empty() && pr[op.top()]>=pr[stock[x][y][i]]) ^ user.cpp:31:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,ls,a,b,ca,cb; ^ user.cpp: In function ‘int calculeaza(char, int, int)’: user.cpp:27:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int calc(int, int)’: user.cpp:92:1: warning: control reaches end of non-void function [-Wreturn-type] } ^