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Cygwin Memory Handling in Arrays
- To: cygwin@sourceware.cygnus.com
- Subject: Cygwin Memory Handling in Arrays
- From: "Ward Correll" <wardless@hotmail.com>
- Date: Sun, 25 Jul 1999 17:43:15 EDT
How does Cygwin manage memory in this c++ program?
I thought that either the arrays sentinelOne[3] or sentinelTwo[3]would have
been over written containing the value from writting past the end of the
array TargetArray[25]. What happened here?
#include <iostream.h>
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] = sentinelTwo[i] = 0;
for (i=0; i<25; i++)
TargetArray[i] = 0;
cout << "Test 1: \n"; // test current values (should be 0)
cout << "TargetArray[0]: " << TargetArray[0] << "\n";
cout << "TargetArray[24]: " << TargetArray[24] << "\n\n";
for (i = 0; i<3; i++)
{
cout << "sentinelOne[" << i << "]: ";
cout << sentinelOne[i] << "\n";
cout << "sentinelTwo[" << i << "]: ";
cout << sentinelTwo[i]<< "\n";
}
cout << "\nAssigning...";
for (i = 0; i<=26; i++)
TargetArray[i] = 20;
cout << "\nTest 2: \n";
cout << "TargetArray[0]: " << TargetArray[0] << "\n";
cout << "TargetArray[24]: " << TargetArray[24] << "\n";
cout << "TargetArray{25}: " << TargetArray[25] << "\n";
cout << "TargetArray[26]: " << TargetArray[26] << "\n\n";
for (i = 0; i<3; i++)
{
cout << "sentinelOne[" << i << "]: ";
cout << sentinelOne[i]<< "\n";
cout << "sentinelTwo[" << i << "]: ";
cout << sentinelTwo[i]<< "\n";
}
return 0;
}
============================OUTPUT===================================
Test 1:
TargetArray[0]: 0
TargetArray[24]: 0
sentinelOne[0]: 0
sentinelTwo[0]: 0
sentinelOne[1]: 0
sentinelTwo[1]: 0
sentinelOne[2]: 0
sentinelTwo[2]: 0
Assigning...
Test 2:
TargetArray[0]: 20
TargetArray[24]: 20
TargetArray{25}: 20
TargetArray[26]: 20
sentinelOne[0]: 0
sentinelTwo[0]: 0
sentinelOne[1]: 0
sentinelTwo[1]: 0
sentinelOne[2]: 0
sentinelTwo[2]: 0
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