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Update SwapNumberWithoutThird.java

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Original file line number	Diff line number	Diff line change
`@@ -1 +1,16 @@`
	`1`	`+public class SwapNumberWithoutThird {`
`1`	`2`
	`3`	`+ public static void swapNumbers(int a, int b) {`
	`4`	`+ b = b + a;`
	`5`	`+ a = b - a;`
	`6`	`+ b = b - a;`
	`7`	`+ }`
	`8`	`+`
	`9`	`+ public static void main(String[] args) {`
	`10`	`+ int a = 10;`
	`11`	`+ int b = 20;`
	`12`	`+ swapNumbers(a, b);`
	`13`	`+ System.out.printf("a is %d, b is %d %n", a, b); // a is 10, b is 20`
	`14`	`+ }`
	`15`	`+`
	`16`	`+}`

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