#include<stdio.h>
main()
{
	int x,y,t;
	printf("enter x&y:\n");
		scanf("x=%d y=%d\n",x,y);
		t=x;x=y;y=t;
		printf("x=%d y=%d\n",x,y);

}


scanf("x=%d y=%d\n",x,y); 改成scanf("x=%d y=%d\n",&x,&y);