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c语言教程之枚举类型

原文链接
注:以下全部代码的执行环境为VC++ 6.0

在程序中,可能需要为某些整数定义一个别名,我们可以利用预处理指令#define来完成这项工作,您的代码可能是:

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#define MON  1
#define TUE 2
#define WED 3
#define THU 4
#define FRI 5
#define SAT 6
#define SUN 7

在此,我们定义一种新的数据类型,希望它能完成同样的工作。这种新的数据类型叫枚举型。

1. 定义一种新的数据类型 - 枚举型

以下代码定义了这种新的数据类型 - 枚举型

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enum DAY
{
MON=1, TUE, WED, THU, FRI, SAT, SUN
};

(1) 枚举型是一个集合,集合中的元素(枚举成员)是一些命名的整型常量,元素之间用逗号,隔开。

(2) DAY是一个标识符,可以看成这个集合的名字,是一个可选项,即是可有可无的项。

(3) 第一个枚举成员的默认值为整型的0,后续枚举成员的值在前一个成员上加1。

(4) 可以人为设定枚举成员的值,从而自定义某个范围内的整数。

(5) 枚举型是预处理指令#define的替代。

(6) 类型定义以分号;结束。

2. 使用枚举类型对变量进行声明

新的数据类型定义完成后,它就可以使用了。我们已经见过最基本的数据类型,如:整型int, 单精度浮点型float, 双精度浮点型double, 字符型char, 短整型short等等。用这些基本数据类型声明变量通常是这样:

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char     a; //变量a的类型均为字符型char
char letter;
int x,
y,
z; //变量x,y和z的类型均为整型int
int number;
double m, n;
double result; //变量result的类型为双精度浮点型double

既然枚举也是一种数据类型,那么它和基本数据类型一样也可以对变量进行声明。

方法一:枚举类型的定义和变量的声明分开

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enum DAY
{
MON=1, TUE, WED, THU, FRI, SAT, SUN
};
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enum DAY yesterday;
enum DAY today;
enum DAY tomorrow; //变量tomorrow的类型为枚举型enum DAY
enum DAY good_day, bad_day; //变量good_day和bad_day的类型均为枚举型enum DAY

方法二:类型定义与变量声明同时进行:

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enum //跟第一个定义不同的是,此处的标号DAY省略,这是允许的。
{
saturday,
sunday = 0,
monday,
tuesday,
wednesday,
thursday,
friday
} workday; //变量workday的类型为枚举型enum DAY
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enum week { Mon=1, Tue, Wed, Thu, Fri Sat, Sun} days; //变量days的类型为枚举型enum week
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enum BOOLEAN { false, true } end_flag, match_flag; //定义枚举类型并声明了两个枚举型变量

方法三:用typedef关键字将枚举类型定义成别名,并利用该别名进行变量声明:

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typedef enum workday
{
saturday,
sunday = 0,
monday,
tuesday,
wednesday,
thursday,
friday
} workday; //此处的workday为枚举型enum workday的别名
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workday today, tomorrow; //变量today和tomorrow的类型为枚举型workday,也即enum workday

enum workday中的workday可以省略:

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typedef enum
{
saturday,
sunday = 0,
monday,
tuesday,
wednesday,
thursday,
friday
} workday; //此处的workday为枚举型enum workday的别名
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workday today, tomorrow; //变量today和tomorrow的类型为枚举型workday,也即enum workday

也可以用这种方式:

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typedef enum workday
{
saturday,
sunday = 0,
monday,
tuesday,
wednesday,
thursday,
friday
};
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workday today, tomorrow; //变量today和tomorrow的类型为枚举型workday,也即enum workday

注意:同一个程序中不能定义同名的枚举类型,不同的枚举类型中也不能存在同名的命名常量。错误示例如下所示:

$\color{red}{错误声明一:}$存在同名的枚举类型

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typedef enum
{
wednesday,
thursday,
friday
} workday;
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typedef enum WEEK
{
saturday,
sunday = 0,
monday,
} workday;

$\color{red}{错误声明二:}$存在同名的枚举成员

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typedef enum
{
wednesday,
thursday,
friday
} workday_1;

typedef enum WEEK
{
wednesday,
sunday = 0,
monday,
} workday_2;

3.使用枚举类型的变量

3.1 对枚举型的变量赋值。

实例将枚举类型的赋值与基本数据类型的赋值进行了对比:

方法一:先声明变量,再对变量赋值

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#include<stdio.h>

/* 定义枚举类型 */
enum DAY { MON=1, TUE, WED, THU, FRI, SAT, SUN };

void main()
{
/* 使用基本数据类型声明变量,然后对变量赋值 */
int x, y, z;

x = 10;
y = 20;
z = 30;

/* 使用枚举类型声明变量,再对枚举型变量赋值 */
enum DAY yesterday, today, tomorrow;

yesterday = MON;
today = TUE;
tomorrow = WED;

printf("%d %d %d \n", yesterday, today, tomorrow);
}

方法二:声明变量的同时赋初值

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#include <stdio.h>

/* 定义枚举类型 */
enum DAY { MON=1, TUE, WED, THU, FRI, SAT, SUN };

void main()
{
/* 使用基本数据类型声明变量同时对变量赋初值 */
int x=10, y=20, z=30;

/* 使用枚举类型声明变量同时对枚举型变量赋初值 */
enum DAY yesterday = MON,
today = TUE,
tomorrow = WED;

printf("%d %d %d \n", yesterday, today, tomorrow);
}

方法三:定义类型的同时声明变量,然后对变量赋值。

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#include <stdio.h>

/* 定义枚举类型,同时声明该类型的三个变量,它们都为全局变量 */
enum DAY { MON=1, TUE, WED, THU, FRI, SAT, SUN } yesterday, today, tomorrow;

/* 定义三个具有基本数据类型的变量,它们都为全局变量 */
int x, y, z;

void main()
{
/* 对基本数据类型的变量赋值 */
x = 10; y = 20; z = 30;

/* 对枚举型的变量赋值 */
yesterday = MON;
today = TUE;
tomorrow = WED;

printf("%d %d %d \n", x, y, z); //输出:10 20 30
printf("%d %d %d \n", yesterday, today, tomorrow); //输出:1 2 3
}

方法四:类型定义,变量声明,赋初值同时进行。

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#include <stdio.h>

/* 定义枚举类型,同时声明该类型的三个变量,并赋初值。它们都为全局变量 */
enum DAY
{
MON=1,
TUE,
WED,
THU,
FRI,
SAT,
SUN
}
yesterday = MON, today = TUE, tomorrow = WED;

/* 定义三个具有基本数据类型的变量,并赋初值。它们都为全局变量 */
int x = 10, y = 20, z = 30;

void main()
{
printf("%d %d %d \n", x, y, z); //输出:10 20 30
printf("%d %d %d \n", yesterday, today, tomorrow); //输出:1 2 3
}

3.2 对枚举型的变量赋整数值时,需要进行类型转换。

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#include <stdio.h>

enum DAY { MON=1, TUE, WED, THU, FRI, SAT, SUN };

void main()
{
enum DAY yesterday, today, tomorrow;

yesterday = TUE;
today = (enum DAY) (yesterday + 1); //类型转换
tomorrow = (enum DAY) 30; //类型转换
//tomorrow = 3; //错误

printf("%d %d %d \n", yesterday, today, tomorrow); //输出:2 3 30
}

3.3 使用枚举型变量

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#include<stdio.h>

enum
{
BELL = '\a',
BACKSPACE = '\b',
HTAB = '\t',
RETURN = '\r',
NEWLINE = '\n',
VTAB = '\v',
SPACE = ' '
};

enum BOOLEAN { FALSE = 0, TRUE } match_flag;

void main()
{
int index = 0;
int count_of_letter = 0;
int count_of_space = 0;

char str[] = "I'm Ely efod";

match_flag = FALSE;

for(; str[index] != '\0'; index++)
if( SPACE != str[index] )
count_of_letter++;
else
{
match_flag = (enum BOOLEAN) 1;
count_of_space++;
}

printf("%s %d times %c", match_flag ? "match" : "not match", count_of_space, NEWLINE);
printf("count of letters: %d %c%c", count_of_letter, NEWLINE, RETURN);
}

输出:

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match 2 times
count of letters: 10
Press any key to continue

4. 枚举类型与sizeof运算符

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#include <stdio.h>

enum escapes
{
BELL = '\a',
BACKSPACE = '\b',
HTAB = '\t',
RETURN = '\r',
NEWLINE = '\n',
VTAB = '\v',
SPACE = ' '
};

enum BOOLEAN { FALSE = 0, TRUE } match_flag;

void main()
{
printf("%d bytes \n", sizeof(enum escapes)); //4 bytes
printf("%d bytes \n", sizeof(escapes)); //4 bytes

printf("%d bytes \n", sizeof(enum BOOLEAN)); //4 bytes
printf("%d bytes \n", sizeof(BOOLEAN)); //4 bytes
printf("%d bytes \n", sizeof(match_flag)); //4 bytes

printf("%d bytes \n", sizeof(SPACE)); //4 bytes
printf("%d bytes \n", sizeof(NEWLINE)); //4 bytes
printf("%d bytes \n", sizeof(FALSE)); //4 bytes
printf("%d bytes \n", sizeof(0)); //4 bytes
}

5. 综合举例

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#include<stdio.h>

enum Season
{
spring, summer=100, fall=96, winter
};

typedef enum
{
Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday
}
Weekday;

void main()
{
/* Season */
printf("%d \n", spring); // 0
printf("%d, %c \n", summer, summer); // 100, d
printf("%d \n", fall+winter); // 193

Season mySeason=winter;
if(winter==mySeason)
printf("mySeason is winter \n"); // mySeason is winter

int x=100;
if(x==summer)
printf("x is equal to summer\n"); // x is equal to summer

printf("%d bytes\n", sizeof(spring)); // 4 bytes

/* Weekday */
printf("sizeof Weekday is: %d \n", sizeof(Weekday)); //sizeof Weekday is: 4

Weekday today = Saturday;
Weekday tomorrow;
if(today == Monday)
tomorrow = Tuesday;
else
tomorrow = (Weekday) (today + 1); //remember to convert from int to Weekday
}