string size grows : string size « string

string size grows : string size « string « C++ Tutorial

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C++ Tutorial » string » string size

15.21.4.string size grows

#include <string>

#include <iostream>



using namespace std;



int main( ) {



   string s = "";

   string sr = "";



   sr.reserve(9);



   cout << "s.length    = " << s.length( )   << '\n';

   cout << "s.capacity  = " << s.capacity( ) << '\n';

   cout << "s.max_size  = " << s.max_size( ) << '\n';



   cout << "sr.length   = " << sr.length( )   << '\n';

   cout << "sr.capacity = " << sr.capacity( ) << '\n';

   cout << "sr.max_size = " << sr.max_size( ) << '\n';



   for (int i = 0; i < 20; ++i) {

      if (s.length( ) == s.capacity( )) {

         cout << "s reached capacity of " << s.length( )

              << ", growing...\n";

      }

      if (sr.length( ) == sr.capacity( )) {

         cout << "sr reached capacity of " << sr.length( )

              << ", growing...\n";

      }

      s += 'x';

      sr += 'x';

   }

}

s.length    = 0
s.capacity  = 0
s.max_size  = 1073741820
sr.length   = 0
sr.capacity = 9
sr.max_size = 1073741820
s reached capacity of 0, growing...
s reached capacity of 1, growing...
s reached capacity of 2, growing...
s reached capacity of 3, growing...
s reached capacity of 4, growing...
s reached capacity of 5, growing...
s reached capacity of 6, growing...
s reached capacity of 7, growing...
s reached capacity of 8, growing...
s reached capacity of 9, growing...
sr reached capacity of 9, growing...
s reached capacity of 10, growing...
sr reached capacity of 10, growing...
s reached capacity of 11, growing...
sr reached capacity of 11, growing...
s reached capacity of 12, growing...
sr reached capacity of 12, growing...
s reached capacity of 13, growing...
sr reached capacity of 13, growing...
s reached capacity of 14, growing...
sr reached capacity of 14, growing...
s reached capacity of 15, growing...
sr reached capacity of 15, growing...
s reached capacity of 16, growing...
sr reached capacity of 16, growing...
s reached capacity of 17, growing...
sr reached capacity of 17, growing...
s reached capacity of 18, growing...
sr reached capacity of 18, growing...
s reached capacity of 19, growing...
sr reached capacity of 19, growing...

15.21.string size
	15.21.1.	Use string.length() to check the string's size
	15.21.2.	Display the size of a string
	15.21.3.	string.size()
	15.21.4.	string size grows
	15.21.5.	Display the maximum string length
	15.21.6.	Display the capacity of a string
	15.21.7.	Set the capacity of a string to 128.
	15.21.8.	string.size(), string.length, string.capacity(), string.max_size()
	15.21.9.	functions related to size and capacity

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