Notesale: Turn your study into money

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1
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This can be
extended to both sides, making it open-ended
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Storing Values in Memory
To store a value in memory, we need to know how much space will be allocated for it
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The number 5 would need to be converted to bin
ary, which is 32 bits or 4 bytes
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So, if we were storing an integer, it would take up 2-4 bytes in memory
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For example, the value stored in a variable could be 5, which would be r
epresented as 101 in binary
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For example, an array of charact
ers would be of the data type char, and an array of integers would be of the data type int
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To declare an array in programming, we use a specific syntax
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To declare an array, we would use:
int a[16];
This creates an array called "a" with 16 elements
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For example, we could initialize an array of integers with the val
ues 1, 2, and 3 like this:
int a[3] = {1, 2, 3};
Representing Arrays in Memory
To represent an array in memory, we need to know how the elements of the array are stored
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Each element of the array takes up space in memory, depending on its data type
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Overall, understanding memory and arrays is crucial to programming, as they are fundamental building bl
ocks of many programs and applications
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All the elements in an array are store
d in consecutive/continuous locations with the index starting at zero
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One important point to note is that arrays are fixed-size
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Accessing Array Elements

The index of the array starts at zero (although it can start at one in some cases)
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To access an element, use th
e formula: base address + (i * size of data type)
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Dynamic Allocation
The drawback of arrays is that the size needs to be specified at compile time, which may not always be p
ossible
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If we allocate more space than neede
d, there will be unused memory
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To dynamically allocate memory, we use functions such as ’malloc’ and ’calloc’
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Error Handling
Unfortunately, there were some errors in the original text, making it difficult to understand
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If you encounter any errors, please let me know
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In the next video, we will discuss how to initialize an array at compile time and how to store data in the ar
ray at runtime
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Additionally, we
will examine memory management and show how to use it to test our own code
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In the next video,
we will cover how to insert data into arrays, traverse arrays, and work with 2D arrays
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Arrays can have drawbacks, such as requiring elements of the same data type and not knowing the index
value
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