Check out example codes for "c++ forbids comparison between pointer and integer". It will help you in understanding the concepts better.
Code Example 1
char a defines an array of char's. a is a pointer to the memory at the beginning of the array and using == won't actually compare the contents of a with 'ab' because they aren't actually the same types, 'ab' is integer type. Also 'ab' should be "ab" otherwise you'll have problems here too. To compare arrays of char you'd want to use strcmp. Something that might be illustrative is looking at the typeid of 'ab':
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