原完整教程鏈接：6.2 Arrays (Part II)
1.
// Initialize all elements to 0
int array[5] = { };
2.
// Enum classes don’t have an implicit conversion to integer,
// however standard Enum does.
// So, how to solve this?
//** Use a standard enum inside of a namespace!**
namespace StudentNames
{
enum StudentNames
{
KENNY, // 0
KYLE, // 1
STAN, // 2
BUTTERS, // 3
CARTMAN, // 4
WENDY, // 5
MAX_STUDENTS // 6
};
}
int main()
{
int testScores[StudentNames::MAX_STUDENTS]; // allocate 6 integers
testScores[StudentNames::STAN] = 76;
}
3.
Although passing an array to a function at first glance looks just like
passing a normal variable, underneath the hood, C++ treats arrays differently.
When a normal variable is passed by value, C++ copies the value
of the argument into the function parameter. Because the parameter
is a copy, changing the value of the parameter does not change the
value of the original argument.
However, because copying large arrays can be very expensive,
C++ does not copy an array when an array is passed into a
function. Instead, the actual array is passed. This has the side effect
of allowing functions to directly change the value of array elements!
4.
// Determining the length of a fixed array
int main()
{
double arr[9] = {};
int length_of_arr = sizeof(arr) / sizeof(arr[0]); // <-- Just this line!
for (int i = 0; i < length_of_arr; i++)
{
cout << arr[i] << endl;
}
return 0;
}
