In first example you are reading it as ’20’ and ‘3’ -> So not equal.
In second exmple you are reading it as ’20’ and ‘ 3’-> note space.
Its not 2 vs 3. It is 20 vs 3. %d will read whole string. You may want to check with %1d
Return from strcmp
Returns an integral value indicating the relationship between the
strings: A zero value indicates that both strings are equal. A value
greater than zero indicates that the first character that does not
match has a greater value in str1 than in str2; And a value less than
zero indicates the opposite.
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solved Format specifier behavior in C [closed]