C 引用报错,该怎么解决

C 引用报错

C/C++ code

#include <stdio.h>#include <stdlib.h>void Exchg1(int &x, int &y){    int tmp = x;    x = y;    y = tmp;    printf("x = %d, y = %d.\n", x, y);}main(){    int a = 4, b = 6;    Exchg1(a, b);    printf("a = %d, b = %d.\n", a, b);    getch();}