re-formatting
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@@ -125,7 +125,7 @@ delete q;
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## 6.3 Dynamic Allocation of Arrays
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- How do we allocate an array on the stack? What is the code? What memory diagram is produced by the code?
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- Declaring the size of an array at compile time doesn’t offer much flexibility. Instead we can dynamically allocate an array based on data. This gets us part-way toward the behavior of the standard library vector class. Here’s an example:
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- Declaring the size of an array at compile time doesn’t offer much flexibility. Instead we can dynamically allocate an array based on data. Here’s an example:
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<table>
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<tr>
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@@ -161,14 +161,11 @@ array are not known until the program is executed and the the memory must be all
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In fact, the expression a[i] is exactly equivalent to the pointer arithmetic and dereferencing expression *(a+i)
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which we have seen several times before.
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- After we are done using the array, the line: delete [] a; releases the memory allocated for the entire
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array and calls the destructor (we’ll learn about these soon!) for each slot of the array. Deleting a dynamically
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allocated array without the [] is an error (but it may not cause a crash or other noticeable problem, depending
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array and calls the destructor for each slot of the array. Deleting a dynamically allocated array without the [] is an error (but it may not cause a crash or other noticeable problem, depending
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on the type stored in the array and the specific compiler implementation).
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- Since the program is ending, releasing the memory is not a major concern. However, to demonstrate
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that you understand memory allocation & deallocation, you should always delete dynamically allocated
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- Since the program is ending, releasing the memory is not a major concern. However, to demonstrate that you understand memory allocation & deallocation, you should always delete dynamically allocated
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memory in this course, even if the program is terminating.
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- In more substantial programs it is ABSOLUTELY CRUCIAL. If we forget to release memory repeatedly
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the program can be said to have a memory leak. Long-running programs with memory leaks will eventually
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- In more substantial programs it is ABSOLUTELY CRUCIAL. If we forget to release memory repeatedly the program can be said to have a memory leak. Long-running programs with memory leaks will eventually
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run out of memory and crash.
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- Play this [animation](https://jidongxiao.github.io/CSCI1200-DataStructures/animations/dynamic_memory/example2/index.html) to see what exactly the above code snippet does.
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