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.
1 /* 2ms */ 2 3 public class Solution { 4 5 int quyu(int a,int q){ 6 while(a%q==0){ 7 a=a/q; 8 }return a; 9 } 10 public boolean isUgly(int num) { 11 12 if(num==0){ 13 return false; 14 } 15 num=quyu(num,2); 16 num=quyu(num,3); 17 num=quyu(num,5); 18 19 if(num==1){ 20 return true; 21 }else{ 22 return false; 23 } 24 } 25 }
1 /* 5ms */ 2 3 public class Solution { 4 5 public boolean isUgly(int num) { 6 7 if(num==0) return false; 8 while(num%2==0) num/=2; 9 while(num%3==0) num/=3; 10 while(num%5==0) num/=5; 11 12 if(num==1) return true; 13 else return false; 14 } 15 }
1 /************************************************************************* 2 > File Name: LeetCode263.c 3 > Author: Juntaran 4 > Mail: JuntaranMail@gmail.com 5 > Created Time: Wed 18 May 2016 19:45:08 PM CST 6 ************************************************************************/ 7 8 /************************************************************************* 9 10 Ugly Number 11 12 Write a program to check whether a given number is an ugly number. 13 14 Ugly numbers are positive numbers whose prime factors 15 only include 2, 3, 5. For example, 6, 8 are ugly while 14 is not ugly 16 since it includes another prime factor 7. 17 18 Note that 1 is typically treated as an ugly number. 19 20 ************************************************************************/ 21 22 #include <stdio.h> 23 24 int quyu( int num, int q ) 25 { 26 while( num % q == 0 ) 27 { 28 num = num / q; 29 } 30 return num; 31 } 32 33 int isUgly(int num) 34 { 35 if( num <= 0 ) 36 { 37 return 1; 38 } 39 num = quyu( num, 2 ); 40 num = quyu( num, 3 ); 41 num = quyu( num, 5 ); 42 43 if( num == 1 ) 44 { 45 return 1; 46 } 47 else 48 { 49 return 0; 50 } 51 } 52 53 int main() 54 { 55 int num = 6; 56 int ret = isUgly(num); 57 printf("%d ", ret); 58 }