这可能只是一个简单的错误，我没有看到，但我认为我只是做错了什么。别担心，我没有在我的头函数中使用命名空间std或任何似乎是这个人的问题[问题我读到类似于我的][1] [1]：Why am I getting string does not name a type Error?
我现在有四个错误：
C：\Documents and Settings\Me\My Documents\C ++ Projects\C ++\RandomSentence\Nouns.h| 8|错误：命名空间“std”中的“string”未命名类型|
C：\Documents and Settings\Me\My Documents\C ++ Projects\C ++\RandomSentence\Nouns.h| 12|错误：命名空间“std”中的“string”未命名类型|
C：\Documents and Settings\Me\My Documents\C ++ Projects\C ++\RandomSentence\Nouns.h| 13|错误：命名空间“std”中的“string”未命名类型|
C：\Documents and Settings\Me\My Documents\C ++ Projects\C ++\RandomSentence\Nouns.cpp| 9|错误：no 'std：：string Nouns：：nounGenerator（）'成员函数在类'Nouns'中声明|
||===构建完成：4错误，0警告===|
下面是我的头文件：

class Nouns
{
    public:
        Nouns();
        std::string noun;
    protected:
    private:
        int rnp; // random noun picker
        std::string dog, cat, rat, coat, toilet, lizard, mime, clown, barbie, pig, lamp, chair, hanger, pancake, biscut, ferret, blanket, tree, door, radio;
        std::string nounGenerator()
};

这是我的cpp文件：

#include "Nouns.h"
#include <iostream>

Nouns::Nouns()
{

}

std::string Nouns::nounGenerator(){
    RollRandom rollRandObj;

    rnp = rollRandObj.randNum;

    switch(rnp){
    case 1:
        noun = "dog";
        break;
    case 2:
        noun = "cat";
        break;
    case 3:
        noun = "rat";
        break;
    case 4:
        noun = "coat";
        break;
    case 5:
        noun = "toilet";
        break;
    case 6:
        noun = "lizard";
        break;
    case 7:
        noun = "mime";
        break;
    case 8:
        noun = "clown";
        break;
    case 9:
        noun = "barbie";
        break;
    case 10:
        noun = "pig";
        break;
    case 11:
        noun = "lamp";
        break;
    case 12:
        noun = "chair";
        break;
    case 13:
        noun = "hanger";
        break;
    case 14:
        noun = "pancake";
        break;
    case 15:
        noun = "biscut";
        break;
    case 16:
        noun = "ferret";
        break;
    case 17:
        noun = "blanket";
        break;
    case 18:
        noun = "tree";
        break;
    case 19:
        noun = "door";
        break;
    case 20:
        noun = "radio";
        break;
    }

    return noun;
}