Does This 'for' Loop in C++ Cause an Error?

  • Context: C/C++ 
  • Thread starter Thread starter ineedhelpnow
  • Start date Start date
  • Tags Tags
    Loops
Click For Summary
SUMMARY

The provided C++ 'for' loop results in an error due to an out-of-bounds access. The loop iterates over the indices of the array 'itemsList', but the statement 'itemsList.at(i) = itemsList.at(i+1)' attempts to access an index that exceeds the array's bounds when 'i' equals 'itemsLast.size() - 1'. This leads to undefined behavior as it tries to access 'itemsList.at(n)', where 'n' is the size of the array.

PREREQUISITES
  • Understanding of C++ syntax and control structures
  • Knowledge of array indexing and bounds in C++
  • Familiarity with the STL (Standard Template Library) and its containers
  • Experience with debugging and error handling in C++
NEXT STEPS
  • Research C++ array bounds checking techniques
  • Learn about the use of STL containers like std::vector
  • Explore C++ exception handling for runtime errors
  • Study best practices for loop constructs in C++ to avoid common pitfalls
USEFUL FOR

C++ developers, software engineers, and students learning about array manipulation and error handling in programming.

ineedhelpnow
Messages
649
Reaction score
0
does this result in an error?

for (i = 0; i < itemsLast.size(); ++i)
{
itemsList.at(i) = itemsList.at(i+1);
}
 
Technology news on Phys.org
Counting begins at zero, so if you have an array with $n$ elements, the index value for the last element is therefore $n-1$. So, does the loop result in an error?
 
Yes
 

Similar threads

  • · Replies 14 ·
Replies
14
Views
3K
  • · Replies 22 ·
Replies
22
Views
4K
  • · Replies 2 ·
Replies
2
Views
1K
  • · Replies 11 ·
Replies
11
Views
1K
  • · Replies 1 ·
Replies
1
Views
4K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 4 ·
Replies
4
Views
1K
  • · Replies 11 ·
Replies
11
Views
2K