c++ - 简单的 C++ 语法更正

Question

下面的 C++ 代码有什么问题吗？

int i;
int n;
cout << "a";
cin >> n;
int player[i];
for(i = 0; i <= 3; i++)
{
     player[i] = n;
}

Answer 1

要获得相同的功能，我会这样做:

#define PLAYER_SIZE 4
//Or you can go:
//const int PLAYER_SIZE = 4;
int n = 0; //Don't *need* to = 0 in this case, but good practice.
cout << "a";
cin >> n;
int player[ PLAYER_SIZE ];
for( int i = 0; i < PLAYER_SIZE; ++i )
{
     player[i] = n;
}

因为在这种情况下 i<=3 是硬编码的，所以没有必要高于 4。