foo.cc: In function 'int main()':
foo.cc:10:9: error: invalid types 'int[int]' for array subscript
   10 |   if(a[i]>='0'&&a[i]<='9')
      |         ^
foo.cc:10:20: error: invalid types 'int[int]' for array subscript
   10 |   if(a[i]>='0'&&a[i]<='9')
      |                    ^
foo.cc:14:11: error: invalid types 'int[int]' for array subscript
   14 |    if((a[i]>='a'&&a[i]<='z')||(a[i]>='A'&&a[i]<='Z'))
      |           ^
foo.cc:14:22: error: invalid types 'int[int]' for array subscript
   14 |    if((a[i]>='a'&&a[i]<='z')||(a[i]>='A'&&a[i]<='Z'))
      |                      ^
foo.cc:14:35: error: invalid types 'int[int]' for array subscript
   14 |    if((a[i]>='a'&&a[i]<='z')||(a[i]>='A'&&a[i]<='Z'))
      |                                   ^
foo.cc:14:46: error: invalid types 'int[int]' for array subscript
   14 |    if((a[i]>='a'&&a[i]<='z')||(a[i]>='A'&&a[i]<='Z'))
      |                                              ^

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