Why does x[y] == y[x] in c++?

2018-07-01 02:21:27

Possible Duplicate:
In C arrays why is this true? a[5] == 5[a]

Someone told me this... I didn't believe them at first but it does work. If x and y do not change throughout the code, why does this work:

int x [5] = { 0,1,2,3,4};
int y = 3;

if(x[y] == y[x]){
    cout << "Why..." << endl;
}

How does x array's value in index y is = the x index's value's in array y? But there was no y array.

It is always true (for normal operator==)

a[i]  --> *(a+i) --> *(i+a) --> i[a]

since int is intrinsic and has commutative operator==, this will always be true

因为以下所有内容都是相同的：

x[y] == y[x] == *(x+y) == *(y+x)

因为x[y]只是说*(x + y)另一种方式，并且与*(y + x) 。

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