Compilare: user.cpp: In function ‘int main()’: user.cpp:31:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[i][j]=c-'0'; ^ user.cpp:31:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[i][j]=c-'0'; ^ user.cpp:32:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] b[i][j]=a[i][j]; ^ user.cpp:32:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] b[i][j]=a[i][j]; ^ user.cpp:32:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] b[i][j]=a[i][j]; ^ user.cpp:32:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] b[i][j]=a[i][j]; ^ user.cpp:38:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(b[i][j]==1) ^ user.cpp:38:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(b[i][j]==1) ^ user.cpp:49:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(a[i][j]==1) ^ user.cpp:49:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(a[i][j]==1) ^ user.cpp:53:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] else if(a[i][j]==2) ^ user.cpp:53:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] else if(a[i][j]==2) ^ user.cpp:58:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] else if(a[i][j]==3) ^ user.cpp:58:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] else if(a[i][j]==3) ^