Given the following java code, why is it important that the variable keyid is tested before assigning a value to the keystring variable?
private void handlekeystroke(keyevent e){
int keyid = e. getid();
string keystring
if (keyid == keyevent. key_typed) {
char c = e. getkeychar();
keystring = key character is + c;
} else {
int keycode = e. getkeycode();
keystring = key pressed is + keyevent. getkeytext( keycode);
}

When creating a budget, log fixed expenses before income. after income. after savings. at the top.

Suppose there is a relation r(a, b, c) with a b+-tree index with search keys (a, b).1. what is the worst-case cost of finding records satisfying 10 < a < 50 using this index, in terms of the number of records n1, retrieved and the height h of the tree? 2. what is the worst-case cost of finding records satisfying 10 < a < 50 and 5 < b < 10 using this index, in terms of the number of records n2 that satisfy this selection, as well as n1 and h defined above? 3. under what conditions on n1 and n2, would the index be an efficient way of finding records satisfying the condition from part (2)?

How do i get rid of my member ship for