Commit4f488e4

zongyanqi

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add Easy_504_Base_7

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	`1`	`+/**`
	`2`	`+ *`
	`3`	`+ * Given an integer, return its base 7 string representation.`
	`4`	`+`
	`5`	`+ Example 1:`
	`6`	`+ Input: 100`
	`7`	`+ Output: "202"`
	`8`	`+`
	`9`	`+ Example 2:`
	`10`	`+ Input: -7`
	`11`	`+ Output: "-10"`
	`12`	`+`
	`13`	`+ Note: The input will be in range of [-1e7, 1e7].`
	`14`	`+`
	`15`	`+ */`
	`16`	`+`
	`17`	`+/**`
	`18`	`+ *@param {number} num`
	`19`	`+ *@return {string}`
	`20`	`+ */`
	`21`	`+varconvertToBase7=function(num){`
	`22`	`+`
	`23`	`+if(num===0)return'0';`
	`24`	`+varstr='';`
	`25`	`+varsign=num>0;`
	`26`	`+num=Math.abs(num);`
	`27`	`+while(num){`
	`28`	`+str=(num%7)+str;`
	`29`	`+num=Math.floor(num/7);`
	`30`	`+}`
	`31`	`+`
	`32`	`+returnsign ?str :'-'+str;`
	`33`	`+`
	`34`	`+};`
	`35`	`+`
	`36`	`+console.log(convertToBase7(0));`
	`37`	`+console.log(convertToBase7(100));`
	`38`	`+console.log(convertToBase7(-7));`

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