Article ID: 157433
Article Last Modified on 7/13/2005
APPLIES TO
- The Standard C++ Library, when used with:
- Microsoft Visual C++ 4.2 Enterprise Edition
- Microsoft Visual C++ 5.0 Enterprise Edition
- Microsoft Visual C++ 4.2 Professional Edition
- Microsoft Visual C++ 5.0 Professional Edition
- Microsoft Visual C++ .NET 2002 Standard Edition
- Microsoft Visual C++ .NET 2003 Standard Edition
This article was previously published under Q157433
Note Microsoft Visual C++ .NET 2002 and Microsoft Visual C++ .NET 2003 support both the managed code model that is provided by the Microsoft .NET Framework and the unmanaged native Microsoft Windows code model. The information in this article applies only to unmanaged Visual C++ code.
SUMMARY
The sample code below illustrates how to use the basic_string size() and resize() STL function(s) in Visual C++.
MORE INFORMATION
Required header
<string>
Prototype
size_type size() const;
void resize(size_type n, E c = E());
resize is defined in header xstring which is included indirectly.
Note The class/parameter names in the prototype may not match the version in the header file. Some have been modified to improve readability.
Description
The size() function returns the length of the sequence.
The resize() function changes the size to the length specified by the first parameter. If the sequence is made longer, the function appends elements with the value of the second parameter. This value defaults to a null. The output of the sample code shows spaces for the null characters. operator<< reads the size of string and outputs each character in the string one at a time.
Sample code
//////////////////////////////////////////////////////////////////////
//
// Compile options needed: /GX
//
// <filename> : size.cpp
//
// Functions:
//
// size()
// resize() ; Defined in header xstring which is included indirectly.
//
// Written by Linda Koontz
// of Microsoft Product Support Services,
// Copyright (c) 1996 Microsoft Corporation. All rights reserved.
//////////////////////////////////////////////////////////////////////
#include <iostream>
#include <string>
#if _MSC_VER > 1020 // if VC++ version is > 4.2
using namespace std; // std c++ libs implemented in std
#endif
void main()
{
string TestString = "1111122222333334444455555";
cout << TestString << "\n size: " << TestString.size() << endl;
TestString.resize(5);
cout << TestString << "\n size: " << TestString.size() << endl;
TestString.resize(10);
cout << TestString << "\n size: " << TestString.size() << endl;
TestString.resize(15,'6');
cout << TestString << "\n size: " << TestString.size() << endl;
}
Output is:
1111122222333334444455555
size: 25
11111
size: 5
11111
size: 10
11111 66666
size: 15
REFERENCES
For more information about basic_string size and resize, visit the following Microsoft Developer Network (MSDN) Web site:
Additional query words: STL STLSample size resize
Keywords: kbhowto kbinfo kbtemplate kbstl kbcode kbfunctions KB157433
