What is 'strcmp' in c++ ?

Question

how it works? what is it for?

Answer 1

This is function for comparing C-strings:
int strcmp( const char *str1, const char *str2);
The function gets 2 C strings as arguments, then it compares their corresponding symbols one by one.
It performs a binary comparison of the characters.
It will return 0, if both strings' content is equal. Less than 0, if first unmatched character has a lower value in str1 than in str2. Greater than 0, if first unmatched character has a grearer value in str1 than in str2.