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c
#include<stdio.h>
void swap(int *x,int *y)
{
	int temp;
	temp=*x;*x=*y;*y=temp;
 }
 void main()
 {
 	int a,b;
 	a=4,b=6;
 	swap(&a,&b);
 	printf("a=%d,b=%d\n",a,b);
 }