Question

但我的代码中没有此标记（＆＃39; - ＆＃39;）。我所做的就是尝试分配colors枚举类类型的变量，在每种情况下都是colors的可能值之一，并且我收到此错误：< / p>

error: expected primary-expression before '-' token

在每个案例陈述的每个第一个陈述中。有人可以解释这个错误以及它为什么会发生吗？

完整代码：

源文件

#include "Bunny.h"
#include <cstdlib>
#include <time.h>
#include <string>
#include <iostream>
using namespace std;
Bunny::Bunny() : radioactive_mutant_vampire_bunny(false), age(0)
{
    srand(time(NULL));
    if(rand()%100 + 1 <= 2)
        radioactive_mutant_vampire_bunny = true;
    switch(rand()%4 + 1){
    case 1:
        color = colors.WHITE;
        break;
    case 2:
        color = colors.BROWN;
        break;
    case 3:
        color = colors.BLACK;
        break;
    case 4:
        color = colors.SPOTTED;
        break;
    default:
        cout << "The number entered is outside the range of 1 to 4.";
        break;
    }
    name = names[rand()%names.size()];
}

Bunny::~Bunny()
{
    //dtor
}

标题

#ifndef BUNNY_H
#define BUNNY_H
#include <string>
using namespace std;
class Bunny
{
    public:
        Bunny();
        virtual ~Bunny();
    protected:
    private:
        enum class sex{MALE, FEMALE};
        sex sex;
        enum class colors{WHITE, BROWN, BLACK, SPOTTED};
        colors color;
        int age;
        string names[6] = {"Berry", "Jerry", "Terry", "Marie", "Perry", "Kerry"};
        string name;
        bool radioactive_mutant_vampire_bunny;
};

#endif // BUNNY_H

Answer 1

colors.WHITE是Java风格。在C ++中，您应该写为colors::WHITE。
names.size()无效，因为names不是类，而是数组。

试试这个：

Bunny::Bunny() : radioactive_mutant_vampire_bunny(false), age(0)
{
    srand(time(NULL));
    if(rand()%100 + 1 <= 2)
        radioactive_mutant_vampire_bunny = true;
    switch(rand()%4 + 1){
    case 1:
        color = colors::WHITE;
        break;
    case 2:
        color = colors::BROWN;
        break;
    case 3:
        color = colors::BLACK;
        break;
    case 4:
        color = colors::SPOTTED;
        break;
    default:
        cout << "The number entered is outside the range of 1 to 4.";
        break;
    }
    name = names[rand()%(sizeof(names)/sizeof(*names))];
}

Answer 2

Sys.info()
                 sysname                      release                      version                     nodename 
               "Windows"                      "7 x64" "build 7601, Service Pack 1"               "thepc" 
                 machine                        login                         user               effective_user 
                "x86-64"                  "theuser"  "R version 3.2.5 (2016-04-14)"                  "theuser"                  "theuser"

enum class sex{MALE, FEMALE}; sex sex;的名称为enum class，您无法再次使用sex，重命名您的会员：sex

sex _sex;

这不是case 1: color = colors.WHITE; break; case 2: color = colors.BROWN; break; case 3: color = colors.BLACK; break; case 4: color = colors.SPOTTED; break;的工作方式。使用enum classes运算符代替::运算符。

您的.数组是普通的C数组，普通数组没有strings方法，可以将其设为size()或使用vector用于检查数组长度的习语。

在＆＃39; - ＆＃39;之前预期的初级表达代币

2 个答案: