wangdao-data-structure/ch2/tips2.cpp

#include <stdio.h>

void test(int &x)
{
    x = 1024;
    printf("test 函数内部：x = %d\n", x);
}

int main()
{
    int x = 1;
    printf("调用 test 函数前：x = %d\n", x);
    test(x);
    printf("调用 test 函数后：x = %d\n", x);
}