LeetCode--------------Ugly Number
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Write a program to check whether a given number is an ugly number.
Ugly numbers are positive numbers whose prime factors only include 2, 3, 5
. For example, 6, 8
are ugly while 14
is not ugly since it includes another prime factor 7
.
Note that 1
is typically treated as an ugly number.
Credits:
Special thanks to @jianchao.li.fighter for adding this problem and creating all test cases.
程序如下:
public class Solution {
public boolean isUgly(int num) {
while(num > 0){
if(num % 2 == 0){
num = num/2;
}
else{
break;
}
}
while(num > 0){
if(num % 3 == 0){
num = num/3;
}
else{
break;
}
}
while(num > 0){
if(num % 5 == 0){
num = num/5;
}
else{
break;
}
}
if(num != 1 ){
return false;
}
else{
return true;
}
}
}
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