Question

我正在进行分配以填写空白数据类型。我在“学习C ++进行游戏开发”中多次重读小章节并试过各种类型，但是，我的问题是从颜色调用绿色枚举。

以下是原始代码：

// 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;
}

以下是我目前所完成的内容：

#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调用绿色。我尝试了书中提出的各种组合，但似乎没有任何效果。

请帮忙，以便我可以解决这个问题并理解原因。

提前谢谢。

Answer 1

就像Ceros在评论中所说，你需要附加枚举类型：

colorCode gradebookColor = colorCode::Green;

Answer 2

更改变量的类型。

enum colorCode
{
  Green = 1
};

colorCode gradebookColor = colorCode::Green;

std::cout << gradebookColor << std::endl;

将输出＆＃34; 1＆＃34;

Answer 3

数据类型： - 数据类型是识别数据类型和处理它的相关操作的手段。基本上有两种类型的数据类型 1.基本数据类型（int，char，bool，float，double，void） 2.derived数据类型（数组，指针，结构，类等）有关简单语言的更多详细信息，请单击下面给出的链接 https://simplifiedtutorial4u.blogspot.in/2017/08/data-types-in-c.html

C ++中的数据类型

3 个答案: