C语言基础:枚举.宏

枚举:一组有符号的整型常量,一 一列举所有的状态

枚举常和switch连用

enum week{

monday=1,

tuesday,

wednesday,

thursday,

friday,

saturday,

sunday

};

printf("请输入一个数 \n");

int number = 0;

scanf("%d",&number);

switch (number) {

case monday:

printf("上课敲代码!下课看无码!第%d天",number);

break;

case tuesday:

printf("上课敲代码!下课看无码!第%d天",number);

break;

case wednesday:

printf("上课敲代码!下课看无码!第%d天",number);

break;

case thursday:

printf("上课敲代码!下课看无码!第%d天",number);

break;

case friday:

printf("上课敲代码!下课看无码!第%d天",number);

break;

case saturday:

printf("上课敲代码!下课看无码!第%d天",number);

break;

case sunday:

printf("上课敲代码!下课看无码!第%d天",number);

break;

default:

printf("看多了!!!%d",number);

break;

}

宏:只做简单的替换,在预编译的时候就完成替换

宏名:纯大写

K+大驼峰命名法 如:KArray

有参数,在做替换时,只做简单的替换,不会判断运算符优先级

const int m=0;

m=1; //error,被const修饰的变量是不能被重新赋值的