View Compilation Error

0_0_34377203_25903.cpp: In function 'int main()':
0_0_34377203_25903.cpp:39:8: error: invalid types 'char[int]' for array subscript
     a[i][j] = t;
        ^
0_0_34377203_25903.cpp:40:12: error: invalid types 'char[int]' for array subscript
     a[n-i-1][j] = t;
            ^
0_0_34377203_25903.cpp:44:8: error: invalid types 'char[int]' for array subscript
     a[j][i] = t;
        ^
0_0_34377203_25903.cpp:45:8: error: invalid types 'char[int]' for array subscript
     a[j][n-i-i] = t;
        ^
0_0_34377203_25903.cpp:55:17: error: lvalue required as left operand of assignment
        i==n-1&&j=n-1)
                 ^
0_0_34377203_25903.cpp:58:21: error: invalid types 'char[int]' for array subscript
      printf("%c",a[i][j]);
                     ^