n = 1;
c = (n = 2)* ++n;
都是用VS2015运行结果是9,但是9=3*3,难道后面的自增会影响前面的赋值?
n=2的赋值结果应该是2,为何会变成3呢?
下边是代码测试,VS2015
#include "stdafx.h"
#include <iostream>
#include "stdlib.h"
#include "Test.h"
using std::cout;
using std::cin;
using std::endl;
int add(int a, int b)
{
cout << "a = " << a << ", b = " << b << endl;
int c = a + b;
return c;
}
int main()
{
int n = 1;
int c = add( n = 2, ++n);
cout << "c = " << c << ", n = "<< n<<endl;
cout << "---------------" << endl;
n = 1;
c = add(++n, n = 2);
cout << "c = " << c << ", n = " << n << endl;
cout << "---------------" << endl;
n = 1;
c = add(n = 2, n++);
cout << "c = " << c << ", n = " << n << endl;
cout << "---------------" << endl;
n = 1;
c = add(n++, n = 2);
cout << "c = " << c << ", n = " << n << endl;
cout << "---------------" << endl;
n = 1;
c = (n = 2)* ++n;
cout << "c = "<< c << ", n = "<< n << endl;
cout << "---------------" << endl;
system("pause");
return 0;
}
运行结果: