string.size(), string.length, string.capacity(), string.max_size()

 
 

#include <iostream>
using std::cout;
using std::endl;
using std::cin;
using std::boolalpha;

#include <string>
using std::string;

void display( const string & );

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

   cout << "\n\nEnter a string: ";
   cin >> string1; // delimited by whitespace
   cout << "The string entered was: " << string1;

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


   return 0;
}

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

/* 
Statistics before input:
capacity: 0
max size: 1073741820
size: 0
length: 0
empty: true

Enter a string: a string
The string entered was: a
Statistics after input:
capacity: 1
max size: 1073741820
size: 1
length: 1
empty: false
 */

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1.	Use string.length() to check the string's size
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string.size(), string.length, string.capacity(), string.max_size() : string size « String « C++

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