string overloaded equality and relational operators : string compare « string « C++ Tutorial

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C++ Tutorial » string » string compare

15.7.2.string overloaded equality and relational operators

#include <iostream>

using std::cout;

using std::endl;



#include <string>

using std::string;



int main()

{

   string s1( "AA" );

   string s2( " AAB" );

   string s3;



   // 

   cout << "s1 is \"" << s1 << "\"; s2 is \"" << s2

      << "\"; s3 is \"" << s3 << '\"' 

      << "\n\nThe results of comparing s2 and s1:"

      << "\ns2 == s1 yields " << ( s2 == s1 ? "true" : "false" )

      << "\ns2 != s1 yields " << ( s2 != s1 ? "true" : "false" )

      << "\ns2 >  s1 yields " << ( s2 > s1 ? "true" : "false" ) 

      << "\ns2 <  s1 yields " << ( s2 < s1 ? "true" : "false" )

      << "\ns2 >= s1 yields " << ( s2 >= s1 ? "true" : "false" )

      << "\ns2 <= s1 yields " << ( s2 <= s1 ? "true" : "false" );

   return 0;

}

s1 is "AA"; s2 is " AAB"; s3 is ""

The results of comparing s2 and s1:
s2 == s1 yields false
s2 != s1 yields true
s2 >  s1 yields false
s2 <  s1 yields true
s2 >= s1 yields false
s2 <= s1 yields true

15.7.string compare
	15.7.1.	String: equals
	15.7.2.	string overloaded equality and relational operators
	15.7.3.	Compare string ignoring the case
	15.7.4.	Compare sub string: string4.compare( 0, string2.length(), string2 )
	15.7.5.	Use == > and < to compare strings
	15.7.6.	Use string.compare to compare two strings
	15.7.7.	Compare strings by index: string1.compare( 2, 5, string3, 0, 5)
	15.7.8.	Set with functor for string comparison
	15.7.9.	Case-Sensitive Substring Comparison: equivalent of strncmp()
	15.7.10.	Case-Sensitive Substring Comparison: generalization of strncmp()
	15.7.11.	Case-Sensitive String Comparisons
	15.7.12.	Use std::lexicographical_compare to compare two char arrays

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