c++ string中有没有返回特定字符串出现的次数的函数？

sunboyqq23 2011-08-30 08:48:51

比如“123b123”中查找“123”出现的次数就返回2

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RLib 2011-08-31

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不断的strstr

sunboyqq23 2011-08-31

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[Quote=引用 2 楼 gykgod 的回复:]
木有算几个的油酸位置的

find就能返回字串的位置，您可以找一个删掉，再找直到找不到计个数

C/C++ code

#include <string>
#include <iostream>

int main( )
{
using namespace std;

// The first member function
// search……
[/Quote]
码了这么多行，辛苦了 -_-

turing-complete 2011-08-30

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自己封装一下吧很简单

另外推荐个资源 http://download.csdn.net/source/3510689

gykgod 2011-08-30

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木有算几个的油酸位置的

find就能返回字串的位置，您可以找一个删掉，再找直到找不到计个数





#include <string>

#include <iostream>



int main( )

{

   using namespace std;



   // The first member function

   // searches for a single character in a string

   string str1 ( "Hello Everyone" );

   cout << "The original string str1 is: " << str1 << endl;

   basic_string <char>::size_type indexCh1a, indexCh1b;



   indexCh1a = str1.find ( "e" , 3 );

   if (indexCh1a != string::npos )

      cout << "The index of the 1st 'e' found after the 3rd"

           << " position in str1 is: " << indexCh1a << endl;

   else

      cout << "The character 'e' was not found in str1 ." << endl;



   indexCh1b = str1.find ( "x" );

   if (indexCh1b != string::npos )

      cout << "The index of the 'x' found in str1 is: "

           << indexCh1b << endl << endl;

   else

      cout << "The Character 'x' was not found in str1."

           << endl << endl;



   // The second member function searches a string

   // for a substring as specified by a C-string

   string str2 ( "Let me make this perfectly clear." );

   cout << "The original string str2 is: " << str2 << endl;

   basic_string <char>::size_type indexCh2a, indexCh2b;



   const char *cstr2 = "perfect";

   indexCh2a = str2.find ( cstr2 , 5 );

   if ( indexCh2a != string::npos )

      cout << "The index of the 1st element of 'perfect' "

           << "after\n the 5th position in str2 is: "

           << indexCh2a << endl;

   else

      cout << "The substring 'perfect' was not found in str2 ."

           << endl;



   const char *cstr2b = "imperfectly";

   indexCh2b = str2.find ( cstr2b , 0 );

   if (indexCh2b != string::npos )

      cout << "The index of the 1st element of 'imperfect' "

           << "after\n the 5th position in str3 is: "

           << indexCh2b << endl;

   else

      cout << "The substring 'imperfect' was not found in str2 ."

           << endl << endl;



   // The third member function searches a string

   // for a substring as specified by a C-string

   string str3 ( "This is a sample string for this program" );

   cout << "The original string str3 is: " << str3 << endl;

   basic_string <char>::size_type indexCh3a, indexCh3b;



   const char *cstr3a = "sample";

   indexCh3a = str3.find ( cstr3a );

   if ( indexCh3a != string::npos )

      cout << "The index of the 1st element of sample "

           << "in str3 is: " << indexCh3a << endl;

   else

      cout << "The substring 'perfect' was not found in str3 ."

           << endl;



   const char *cstr3b = "for";

   indexCh3b = str3.find ( cstr3b , indexCh3a + 1 , 2 );

   if (indexCh3b != string::npos )

      cout << "The index of the next occurrence of 'for' is in "

           << "str3 begins at: " << indexCh3b << endl << endl;

   else

      cout << "There is no next occurrence of 'for' in str3 ."

           << endl << endl;



   // The fourth member function searches a string

   // for a substring as specified by a string

   string str4 ( "clearly this perfectly unclear." );

   cout << "The original string str4 is: " << str4 << endl;

   basic_string <char>::size_type indexCh4a, indexCh4b;



   string str4a ( "clear" );

   indexCh4a = str4.find ( str4a , 5 );

   if ( indexCh4a != string::npos )

      cout << "The index of the 1st element of 'clear' "

           << "after\n the 5th position in str4 is: "

           << indexCh4a << endl;

   else

      cout << "The substring 'clear' was not found in str4 ."

           << endl;



   string str4b ( "clear" );

   indexCh4b = str4.find ( str4b );

   if (indexCh4b != string::npos )

      cout << "The index of the 1st element of 'clear' "

           << "in str4 is: "

           << indexCh4b << endl;

   else

      cout << "The substring 'clear' was not found in str4 ."

           << endl << endl;

}