replace.cpp

C语言数值算法程序大全（第二版）,课本文件

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

void replaceChars(string& modifyMe,
  const string& findMe, const string& newChars) {
  // Look in modifyMe for the "find string"
  // starting at position 0
  size_t i = modifyMe.find(findMe, 0);
  // Did we find the string to replace?
  if (i != string::npos)
    // Replace the find string with newChars
    modifyMe.replace(i, newChars.size(), newChars);
}

int main() {
  string bigNews =
   "I thought I saw Elvis in a UFO. "
   "I have been working too hard.";
  string replacement("wig");
  string findMe("UFO");
  // Find "UFO" in bigNews and overwrite it:
  replaceChars(bigNews, findMe, replacement);
  assert(bigNews == "I thought I saw Elvis in a "
         "wig. I have been working too hard.");
} ///:~