operator!= (<string>)

測試，如果左側的字串物件等於右邊的字串物件不相等。

template<class CharType, class Traits, class Allocator>
   bool operator!=(
      const basic_string<CharType, Traits, Allocator>& _Left,
      const basic_string<CharType, Traits, Allocator>& _Right
   );
template<class CharType, class Traits, class Allocator>
   bool operator!=(
      const basic_string<CharType, Traits, Allocator>& _Left,
      const CharType *_Right
   );
template<class CharType, class Traits, class Allocator>
   bool operator!=(
      const CharType *_Left,
      const basic_string<CharType, Traits, Allocator>& _Right
   );

參數

• _Left
  C. 式字串或型別要比較的 basic_string 物件。

• _Right
  C. 式字串或型別要比較的 basic_string 物件。

傳回值

true ，如果左側的字串物件等於右邊的字串物件不是 Dictionary 地相等，否則 false。

備註

在字串物件之間的比較可能會根據其字元配對方式字典比較。 兩個字串相等則為，如果它們有相同數目的字元，而且其個別字元值與相同。 否則就是不相等。

範例

// string_op_ne.cpp
// compile with: /EHsc
#include <string>
#include <iostream>

int main( ) 
{
   using namespace std;

   // Declaring an objects of type basic_string<char>
   string s1 ( "pluck" );
   string s2 ( "strum" );
   cout << "The basic_string s1 = " << s1 << "." << endl;
   cout << "The basic_string s2 = " << s2 << "." << endl;

   // Declaring a C-style string
   char *s3 = "pluck";
   cout << "The C-style string s3 = " << s3 << "." << endl;

   // First member function: comparison between left-side object
   // of type basic_string & right-side object of type basic_string
   if ( s1 != s2 )
      cout << "The strings s1 & s2 are not equal." << endl;
   else
      cout << "The strings s1 & s2 are equal." << endl;

   // Second member function: comparison between left-side object
   // of type basic_string & right-side object of C-syle string type
   if ( s1 != s3 )
      cout << "The strings s1 & s3 are not equal." << endl;
   else
      cout << "The strings s1 & s3 are equal." << endl;

   // Third member function: comparison between left-side object
   // of C-syle string type & right-side object of type basic_string
   if ( s3 != s2 )
      cout << "The strings s3 & s2 are not equal." << endl;
   else
      cout << "The strings s3 & s2 are equal." << endl;
}

需求

標題: <string>

命名空間: std

請參閱

參考

string::operator!=