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power of three

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	`1`	`+/* ==============================================================================`
	`2`	`+ * 功能描述:UglyNumberSln`
	`3`	`+ * 创建者:gz`
	`4`	`+ * 创建日期:2017年5月26日 12:23:33`
	`5`	`+ * ==============================================================================*/`
	`6`	`+using System;`
	`7`	`+using System.Collections.Generic;`
	`8`	`+using System.Linq;`
	`9`	`+using System.Text;`
	`10`	`+// Given an integer, write a function to determine if it is a power of three.`
	`11`	`+// Follow up:`
	`12`	`+// Could you do it without using any loop / recursion?`
	`13`	`+namespace Math.Lib`
	`14`	`+{`
	`15`	`+ /// <summary>`
	`16`	`+ /// PowerOfThreeSln`
	`17`	`+ /// </summary>`
	`18`	`+ public class PowerOfThreeSln`
	`19`	`+ {`
	`20`	`+ public boolean isPowerOfThree(int n)`
	`21`	`+ {`
	`22`	`+ int powcnt = 0;`
	`23`	`+ if(Math.Pow(3,19)<Int32.MaxValue && Math.Pow(3,20)>Int32.MaxValue)`
	`24`	`+ powcnt = 19;`
	`25`	`+ return ( n>0 && Math.Pow(3,19)%n==0);`
	`26`	`+ }`
	`27`	`+`
	`28`	`+ }`
	`29`	`+}`

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