memory.cpp: In function 'void play()':
memory.cpp:16:11: warning: array subscript has type 'char' [-Wchar-subscripts]
16 | if(vis[a]){
| ^
memory.cpp:17:18: warning: array subscript has type 'char' [-Wchar-subscripts]
17 | faceup(vis[a]);
| ^
memory.cpp:21:8: warning: array subscript has type 'char' [-Wchar-subscripts]
21 | vis[a] = i;
| ^
memory.cpp:24:11: warning: array subscript has type 'char' [-Wchar-subscripts]
24 | if(vis[b] && b != a){
| ^
memory.cpp:26:18: warning: array subscript has type 'char' [-Wchar-subscripts]
26 | faceup(vis[b]);
| ^
memory.cpp:28:8: warning: array subscript has type 'char' [-Wchar-subscripts]
28 | vis[b] = i;
| ^