LEET code -- Ugly Number

 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.

簡單

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bool isUgly(int num) { if(num==1 ||num==2||num==3||num==5)return true; if(num==0)return false; while(num%2==0)num/=2; while(num%3==0)num/=3; while(num%5==0)num/=5; return num==1? true:false; }

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bool isUgly(int num) { if(num<=0)return false; for(int i=2;i<=5;i++)while(num%i==0)num/=i; return num==1? true:false; }