fig18_05.cpp

是有关C++编程原理教程的例子程序,全,应该对大家有所帮助

// Fig. 18.5: Fig18_05.cpp
// Demonstrating member functions related to size and capacity.
#include <iostream>
using std::cout;
using std::endl;
using std::cin;
using std::boolalpha;

#include <string>
using std::string;

void printStatistics( const string & );

int main()
{
   string string1;
 
   cout << "Statistics before input:\n" << boolalpha;
   printStatistics( string1 );

   // read in only "tomato" from "tomato soup"
   cout << "\n\nEnter a string: ";
   cin >> string1; // delimited by whitespace
   cout << "The string entered was: " << string1;

   cout << "\nStatistics after input:\n";
   printStatistics( string1 );

   // read in "soup"
   cin >> string1; // delimited by whitespace
   cout << "\n\nThe remaining string is: " << string1 << endl;
   printStatistics( string1 );

   // append 46 characters to string1
   string1 += "1234567890abcdefghijklmnopqrstuvwxyz1234567890";
   cout << "\n\nstring1 is now: " << string1 << endl;
   printStatistics( string1 );

   // add 10 elements to string1
   string1.resize( string1.length() + 10 );
   cout << "\n\nStats after resizing by (length + 10):\n";
   printStatistics( string1 );

   cout << endl;
   return 0;
} // end main

// display string statistics
void printStatistics( const string &stringRef )
{
   cout << "capacity: " << stringRef.capacity() << "\nmax size: "  
      << stringRef.max_size() << "\nsize: " << stringRef.size()
      << "\nlength: " << stringRef.length() 
      << "\nempty: " << stringRef.empty();
} // end printStatistics


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