C++ Array Size
Get the Size of an Array
To get the size of an array, you can use the
cout << sizeof(myNumbers);
Why did the result show
20 instead of
5, when the array contains 5 elements?
It is because the
sizeof() operator returns the size of a type in
You learned from the Data Types chapter that an
type is usually 4 bytes, so from the example above, 4 x 5 (4 bytes x 5 elements) = 20 bytes.
To find out how many elements an array has, you have to divide the size of the array by the size of the data type it contains:
int getArrayLength = sizeof(myNumbers) / sizeof(int);
cout << getArrayLength;