leetcode Valid Perfect Square 题目:https://leetcode.com/problems/valid-perfect-square/
解题思路:利用Math.sqrt 获得值是否等于强制Math.sqrt
public static void main(String[] args) {
int num=16;
boolean perfectSquare = isPerfectSquare(num);
System.out.println(perfectSquare);
}
public static boolean isPerfectSquare(int num) {
double sqrt = Math.sqrt(num);
if(sqrt==(int)sqrt){
return true;
}
return false;
}