The provided array declaration has a syntax error. The correct way to initialize elements in an array using curly braces { } should be:
int arr[] = {11, 3, 5, 2, 9, 23, 56, 0, 67};
Given the corrected array initialization:
arr = {11, 3, 5, 2, 9, 23, 56, 0, 67};
To evaluate the expression arr[4]-2, we can find the value of arr[4] and then subtract 2 from it.
arr[4] = 9
9 - 2 = 7
Therefore, the expression arr[4]-2 evaluates to 7.