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#include <stdio.h>
void Exchg3(int *x, int *y)
{
int tmp = *x;
*x = *y;
*y = tmp;
printf("x = %d,y = %d\n", *x, *y);
}
int main()
{
int a = 4;
int b = 6;
Exchg3(&a, &b);
printf("a = %d, b = %d\n", a, b);
return 0;
}