cmpiter.cpp

Think in C++ 第二版源码

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

// Case insensitive compare function:
int 
stringCmpi(const string& s1, const string& s2) {
  // Select the first element of each string:
  string::const_iterator 
    p1 = s1.begin(), p2 = s2.begin();
  // Don't run past the end:
  while(p1 != s1.end() && p2 != s2.end()) {
    // Compare upper-cased chars:
    if(toupper(*p1) != toupper(*p2))
      // Report which was lexically  greater:
      return (toupper(*p1)<toupper(*p2))? -1 : 1;
    p1++;
    p2++;
  }
  // If they match up to the detected eos, say 
  // which was longer. Return 0 if the same.
  return(s2.size() - s1.size());
}

int main() {
  string s1("Mozart");
  string s2("Modigliani");
  cout << stringCmpi(s1, s2) << endl;
} ///:~