1.cpp

c++的标准模板STL操作

#include <iostream>
#include <string>
#include <list>
using namespace std;
int main (void) 
{
  #define OK 0 
  #define INFO 1
  #define WARNING 2
  int return_code;
  list <string> InfoMessages;
  list <string> WarningMessages;

  // during a program these messages are loaded at various points
  InfoMessages.push_back("Info: Program started");
  // do work...
  WarningMessages.push_back("Warning: No Customer records have been found");
  // do work...
 
  return_code = OK; 
 
  if  (!InfoMessages.empty()) {          // there were info messages
     InfoMessages.push_front("Informational Messages:");
     // ... print the info messages list, we'll see how later
     return_code = INFO;
  }

  if  (!WarningMessages.empty()) {       // there were warning messages
     WarningMessages.push_front("Warning Messages:");
     // ... print the warning messages list, we'll see how later
     return_code = WARNING;              
  }

  // If there were no messages say so.
  if (InfoMessages.empty() && WarningMessages.empty()) {
     cout << "There were no messages " << endl;
  }

for(list < string > ::const_iterator it =InfoMessages.begin();it!=InfoMessages.end();++it)
{

cout<<(*it)<<endl;



}

  return return_code;
}