程序代码：

#include<iostream>
using namespace std;

int main(){
    int a, x;
    x = (a = 3, 6 * 3);
    cout << "x=" << x << " a=" << a<<endl;
    x = a = 3, 6 * a;
    cout << "x=" << x << " a=" << a<<endl;
    return 0;
}