newfind.cpp

Think in C++ 第二版源码

//: C17:NewFind.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
#include <string>
#include <iostream>
using namespace std;

// Make an uppercase copy of s:
string upperCase(string& s) {
  char* buf = new char[s.length()];
  s.copy(buf, s.length());
  for(int i = 0; i < s.length(); i++)
    buf[i] = toupper(buf[i]);
  string r(buf, s.length());
  delete buf;
  return r;
}

// Make a lowercase copy of s:
string lowerCase(string& s) {
  char* buf = new char[s.length()];
  s.copy(buf, s.length());
  for(int i = 0; i < s.length(); i++)
    buf[i] = tolower(buf[i]);
  string r(buf, s.length());
  delete buf;
  return r;
}

int main() {
  string chooseOne("Eenie, meenie, miney, mo");
  cout << chooseOne << endl;
  cout << upperCase(chooseOne) << endl;
  cout << lowerCase(chooseOne) << endl;
  // Case sensitive search
  int i = chooseOne.find("een");
  while(i != string::npos) {
    cout << i << endl;
    i++;
    i = chooseOne.find("een", i);
  }
  // Search lowercase:
  string lcase = lowerCase(chooseOne);
  cout << lcase << endl;
  i = lcase.find("een");
  while(i != lcase.npos) {
    cout << i << endl;
    i++;
    i = lcase.find("een", i);
  }
  // Search uppercase:
  string ucase = upperCase(chooseOne);
  cout << ucase << endl;
  i = ucase.find("EEN");
  while(i != ucase.npos) {
    cout << i << endl;
    i++;
    i = ucase.find("EEN", i);
  }
} ///:~