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Merge pull requestneetcode-gh#1039 from notauserx/7-Reverse-Integer.cs

Create 7-Reverse-Integer.cs

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	`1`	`+publicclassSolution{`
	`2`	`+publicintReverse(intx){`
	`3`	`+intrev=0;`
	`4`	`+`
	`5`	`+while(x!=0){`
	`6`	`+vardigit=x%10;`
	`7`	`+x=x/10;`
	`8`	`+if(rev>Int32.MaxValue/10\|\|`
	`9`	`+// since max value is 2,147,483,647,`
	`10`	`+// last digit greater than 7 will overflow`
	`11`	`+(rev==Int32.MaxValue/10&&digit>7))`
	`12`	`+return0;`
	`13`	`+`
	`14`	`+if(rev<Int32.MinValue/10\|\|`
	`15`	`+// since min value is -2,147,483,648`
	`16`	`+(rev==Int32.MinValue/10&&digit<-8))`
	`17`	`+return0;`
	`18`	`+`
	`19`	`+rev=rev*10+digit;`
	`20`	`+}`
	`21`	`+`
	`22`	`+returnrev;`
	`23`	`+}`
	`24`	`+}`

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