Array Sizes

[Admin]

Some of you had trouble with array sizes, so i'll clarify some stuff.

The size you give an array is the MAXIMUM number of items it can hold.

Code:

int array[100];

means it can only hold 100 items at max. If you tried to do:

Code:

array[101] = 5;

it will crash.

Some of the tasks I give you will require different array sizes. You can do this by first asking for the size of the array:

Code:


int n;
cout << "array size please: "
cin >> n;
int array[n];


Don't ever do this:

Code:


int n; // uninitialized
int array[n];


n is uninitialized, which means it can be ANY value, so it will most likely crash.

[Elusive]

Code:

int array[100];

means it can only hold 100 items at max. If you tried to do:

Code:

array[101] = 5;

it will crash.

I'm not familiar with C++, but isn't the array index zero-based? i.e. if you declare an array of size 100, the indexes you can access are from 0 to 99?
Therefore, array[100] = 5; would also crash..

The highest index you can access is one (1) less than the size you declared the array as; the indexes start at 0, not 1.

Code:


int n = 100;
int array[n];

// Highest accessible index
array[n - 1] = 5;


[Admin]

[quote="Elusive"]

but isn't the array index zero-based?

yeah oops

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