c++ - C++ 中的数据类型

Question

我正在做一项填空数据类型的作业。《Learn C++ for Game Development》里面的小章节我重读了无数遍并尝试了各种类型，但是，我的问题是从枚举。

原代码如下:

// DataTypes.cpp : The data types to declare each of the variables is missing.
// Based on the value being stored in the variable and the comments beside it, 
// fill in the data type at the beginning of each line.  Then compile and run 
// program to make sure you selected the correct types.
//
// After you submit your answers, try changing the values stored in the
// variables.  What can you learn about the different data types?
//

#include "stdafx.h"
#include <cstdlib>
#include <iostream>
using namespace std;

int main(int atgc, const char * arg[])
{
 classAverage = 90.7f; //Decimal number
 letterScore = 'A'; //Single letter
 testScore = 95; //Whole number value
 classTestAverage = 88.4f; //Decimal number, notice the 'f' at the end
 colorCode{
    Green = 1,
    Yellow = 5,
    Red = 10
} gradebookColor; //Stores list of values
gradebookColor = Green; //This line does not need a declaration, it was declared in the line above
 isStudentPassing = true; //Could be true or false

cout << "The class average is currently "
    << classAverage
    << endl;
cout << "The class test average was "
    << classTestAverage
    << endl;
cout << "Your test score was "
    << testScore
    << endl;
cout << "Your current letter score is "
    << letterScore
    << endl;
cout << "The color of your gradebook entry is "
    << gradebookColor
    << endl;
cout << "Are you passing? "
    << boolalpha        //This line allows the word 'true' or 'false' to be printed instead of '0' or '1'
    << isStudentPassing
    << endl;
return 0;
}

这是我到目前为止完成的:

#include "stdafx.h"
#include <cstdlib>
#include <iostream>
using namespace std;

int main(int atgc, const char * arg[])
{
 float classAverage = 90.7f; //Decimal number
 char letterScore = 'A'; //Single letter
 int testScore = 95; //Whole number value
 float classTestAverage = 88.4f; //Decimal number, notice the 'f' at the end
 enum class colorCode {
     Green = 1,
     Yellow = 5,
     Red = 10
 };

unsigned int gradebookColor; //Stores list of values
 colorCode gradebookColor = colorCode::Green; //This line errors out     bool isStudentPassing = true; //Could be true or false
cout << "The class average is currently "
    << classAverage
    << endl;
cout << "The class test average was "
    << classTestAverage
    << endl;
cout << "Your test score was "
    << testScore
    << endl;
cout << "Your current letter score is "
    << letterScore
    << endl;
cout << "The color of your gradebook entry is "
    << gradebookColor
    << endl;
cout << "Are you passing? "
    << boolalpha        //This line allows the word 'true' or 'false' to be printed instead of '0' or '1'
    << isStudentPassing
    << endl;
return 0;
}

我知道我不明白如何称呼绿色。我尝试了书中建议的各种组合，但似乎没有任何效果。

请帮助我解决这个问题并了解原因。

提前谢谢你。

Answer 1

就像 Ceros 在评论中所说的那样，您需要附加枚举类型:

colorCode gradebookColor = colorCode::Green;