I want to find out if a key value is in array .. but it doesn't work..
class Solution {
public int solution(int key, int[] array1) {
int answer = 0;
for(int i=0; i < array1.length; i++) {
if(array1[i] == key) {
answer = i;
}
else return -1;
}
return answer;
}
}
ex ) key : 5 array1 : [1, 2, 3, 4, 5] answer : 4
You should return an answer when you find a match, or when you finish the loop without finding a match.
You should not return -1 if the first element of the array doesn't match your key. You should check all the other elements of the array first.
public int solution(int key, int[] array1) {
for(int i=0; i < array1.length; i++) {
if(array1[i] == key) {
return i;
}
}
return -1;
}
I think you need index of key as output and which you are getting correctly as index of array start from 0. Index for key as 5 is 4 which is correct.
You should put return outside for loop:
class Solution {
public int solution(int key, int[] array1) {
int answer = -1;
for(int i=0; i < array1.length; i++) {
if(array1[i] == key) {
answer = i;
}
}
return answer;
}
}
-1if the key isn't at the first position of the array without checking the other positions.