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c++stringcomparison
Yoda
Yoda

Reputation: 18068

May I compare strings by > < in c++

Exacly as stated in the subject: May I compare strings by > , < in c++. I get no errors but not sure will I always get good result?

string a = "aabbsd", b= "bsdds";
cout<<(a<b);

Is the result is just a luck?

Upvotes: 0

Views: 154

Answers (2)

bash.d
bash.d

Reputation: 13207

This will trigger a lexicographical comparison. From cppreference: 

operator==,!=,<,<=,>,>=(std::basic_string)
C++  Strings library std::basic_string   

template< class T, class Alloc >
bool operator==( basic_string<T,Alloc>& lhs, basic_string<T,Alloc>& rhs );
(1) 

template< class T, class Alloc >
bool operator!=( basic_string<T,Alloc>& lhs, basic_string<T,Alloc>& rhs );
(2) 

template< class T, class Alloc >
bool operator<( basic_string<T,Alloc>& lhs, basic_string<T,Alloc>& rhs );
(3) 

template< class T, class Alloc >
bool operator<=( basic_string<T,Alloc>& lhs, basic_string<T,Alloc>& rhs );
(4) 

template< class T, class Alloc >
bool operator>( basic_string<T,Alloc>& lhs, basic_string<T,Alloc>& rhs );
(5) 

template< class T, class Alloc >
bool operator>=( basic_string<T,Alloc>& lhs, basic_string<T,Alloc>& rhs );
(6)

Compares the contents of two strings.
1-2) Checks if the contents of lhs and rhs are equal, that is, lhs.size() == rhs.size() and each character in lhs has equivalent character in rhs at the same position.
3-6) Compares the contents of lhs and rhs lexicographically. The comparison is performed by a function equivalent to std::lexicographical_compare.

Upvotes: 1

Vinayak Garg
Vinayak Garg

Reputation: 6606

Yes you can. Nothing wrong in it. Only thing to note is that the complexity of operation is linear.

Upvotes: 3

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