strsize.cpp

来自「C语言数值算法程序大全（第二版）,课本文件」· C++ 代码 · 共 33 行

//: C03:StrSize.cpp
// From "Thinking in C++, 2nd Edition, Volume 2"
// by Bruce Eckel & Chuck Allison, (c) 2003 MindView, Inc.
// Available at www.BruceEckel.com.
#include <string>
#include <iostream>
using namespace std;

int main() {
  string bigNews("I saw Elvis in a UFO. ");
  cout << bigNews << endl;
  // How much data have we actually got?
  cout << "Size = " << bigNews.size() << endl;
  // How much can we store without reallocating
  cout << "Capacity = " 
    << bigNews.capacity() << endl;
  // Insert this string in bigNews immediately
  // before bigNews[1]
  bigNews.insert(1, " thought I");
  cout << bigNews << endl;
  cout << "Size = " << bigNews.size() << endl;
  cout << "Capacity = " 
    << bigNews.capacity() << endl;
  // Make sure that there will be this much space
  bigNews.reserve(500);
  // Add this to the end of the string
  bigNews.append("I've been working too hard.");
  cout << bigNews << endl;
  cout << "Size = " << bigNews.size() << endl;
  cout << "Capacity = " 
    << bigNews.capacity() << endl;
} ///:~