c++ - 函数外的代码

Question

我在所有函数之外编写了这段代码:

int l, k;
for (l = 1; l <= node; l++)
{
    for (k = 1; k <= node; k++)
    {
        flow[i][j] = capacity[i][j];
        flow[j][i] = 0;
     }
}

编译时出现以下错误:

shalini@shalini-desktop:~$ g++ -o output fords.cpp
fords.cpp:63: error: expected unqualified-id before ‘for’
fords.cpp:63: error: expected constructor, destructor, or type conversion before ‘<=’ token
fords.cpp:63: error: expected constructor, destructor, or type conversion before ‘++’ tok

Answer 1

您不能在函数之外编写代码。在函数之外您唯一可以拥有的是声明，例如全局变量声明(通常是个坏主意)、函数声明等。尝试将它放在像 int main(){}