list1302.cpp

teach yourself C++ in 21 days 第五版

//Listing 13.2 - Demonstrates what happens when you write 
// past the end of an array
#include <iostream>
using namespace std;
     
int main()
{
   // sentinels
   long sentinelOne[3];
   long TargetArray[25]; // array to fill
   long sentinelTwo[3];
   int i;
   for (i=0; i<3; i++)
   {
      sentinelOne[i] = 0;
      sentinelTwo[i] = 0;
   }   
   for (i=0; i<25; i++)
      TargetArray[i] = 10;
       
   cout << "Test 1: \n";  // test current values (should be 0)
   cout << "TargetArray[0]: " << TargetArray[0] << endl;
   cout << "TargetArray[24]: " << TargetArray[24] << endl << endl;
        
   for (i = 0; i<3; i++)
   {
      cout << "sentinelOne[" << i << "]: ";
      cout << sentinelOne[i] << endl;
      cout << "sentinelTwo[" << i << "]: ";
      cout << sentinelTwo[i]<< endl;
   }
         
   cout << "\nAssigning...";
   for (i = 0; i<=27; i++)   // going a little too far!
      TargetArray[i] = 20;
          
   cout << "\nTest 2: \n"; 
   cout << "TargetArray[0]: " << TargetArray[0] << endl;
   cout << "TargetArray[24]: " << TargetArray[24] << endl;
   cout << "TargetArray[25]: " << TargetArray[25] << endl << endl;
   for (i = 0; i<3; i++)
   {
      cout << "sentinelOne[" << i << "]: ";
      cout << sentinelOne[i]<< endl;
      cout << "sentinelTwo[" << i << "]: ";
      cout << sentinelTwo[i]<< endl;
   }
           
   return 0;
}