小编Rog*_*mbe的帖子

所以我有这个头文件：

#include <iostream>
#include <string>

class Furniture
{
    float width, height, depth;
    std::string name;

public:
    // Constructor
    Furniture(std::string name);
    void ReadDimensions();
    virtual void Print();
};

这个 .cc 文件定义了上面声明的函数：

#include "Furniture.h"

Furniture::Furniture(std::string name)
{
    this->name = name;
}

void Furniture::ReadDimensions()
{
    // Read width
    std::cout << "Enter width: ";
    std::cin >> width;
    // Read height
    std::cout << "Enter height: ";
    std::cin >> height;
    // Read depth
    std::cout << "Enter depth: ";
    std::cin >> depth;

    if (width <= 0 || height <= …

有人能告诉我如何使用这个最新的库来播放 flutter 根目录的 asset 文件夹中的单个音频文件吗？pub.dev 上这个库的代码示例很难理解

如何使用map将字符“_”填充到长度较小的字符串中？

我的代码：

    lst = ['photo', 'music', 'magazine']
def all_eq(lst):
    max_item = max(lst, key = lambda x: len(x))
    max_len = len(max_item)
    for i in lst:
        if len(i) < max_len:
            b = list(map(lambda x: x + "_", lst))
    return b

print(all_eq(['photo', 'music', 'magazine']))

public const A first;
public const B second;

这两行给出错误,我该怎么修改呢.

public class TwoTuple<A,B>
{
    public const A first;
    public const B second;

    public TwoTuple(A  a,B b)
    {
        first=a;
        second=b;
    }

    public String toString()
    {
        return ")"+first+", " +second+")";
    }
}