Compilare: user.cpp: In function ‘int main()’: user.cpp:30:36: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[i + 1] = (a[i] - pCorrect[c] * a[i] - pBack[c] * a[i - 1]) / pCorrect[c]; ^ user.cpp:30:54: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[i + 1] = (a[i] - pCorrect[c] * a[i] - pBack[c] * a[i - 1]) / pCorrect[c]; ^ user.cpp:30:80: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[i + 1] = (a[i] - pCorrect[c] * a[i] - pBack[c] * a[i - 1]) / pCorrect[c]; ^ user.cpp:31:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] b[i + 1] = (b[i] - pWrong[c] * (b[i] + 2) - pBack[c] * (b[i - 1] + 1) - pCorrect[c]) / pCorrect[c]; ^ user.cpp:31:58: warning: array subscript has type ‘char’ [-Wchar-subscripts] b[i + 1] = (b[i] - pWrong[c] * (b[i] + 2) - pBack[c] * (b[i - 1] + 1) - pCorrect[c]) / pCorrect[c]; ^ user.cpp:31:89: warning: array subscript has type ‘char’ [-Wchar-subscripts] b[i + 1] = (b[i] - pWrong[c] * (b[i] + 2) - pBack[c] * (b[i - 1] + 1) - pCorrect[c]) / pCorrect[c]; ^ user.cpp:31:104: warning: array subscript has type ‘char’ [-Wchar-subscripts] b[i + 1] = (b[i] - pWrong[c] * (b[i] + 2) - pBack[c] * (b[i - 1] + 1) - pCorrect[c]) / pCorrect[c]; ^