smallstring2.cpp

C语言数值算法程序大全（第二版）,课本文件

//: C03:SmallString2.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 s1
    ("What is the sound of one clam napping?");
  string s2
    ("Anything worth doing is worth overdoing.");
  string s3("I saw Elvis in a UFO");
  // Copy the first 8 chars
  string s4(s1, 0, 8);
  cout << s4 << endl;
  // Copy 6 chars from the middle of the source
  string s5(s2, 15, 6);
  cout << s5 << endl;
  // Copy from middle to end
  string s6(s3, 6, 15);
  cout << s6 << endl;
  // Copy all sorts of stuff
  string quoteMe = s4 + "that" +  
  // substr() copies 10 chars at element 20
  s1.substr(20, 10) + s5 +
  // substr() copies up to either 100 char
  // or eos starting at element 5 
  "with" + s3.substr(5, 100) +
  // OK to copy a single char this way 
  s1.substr(37, 1);
  cout << quoteMe << endl;
} ///:~