typedefstruct是什么意思typedef⽤于定义⼀种新类型
例如
定义了如下的结构
typedef struct student
{
int age;
int score;
}STUDENT;
那么则有
STUDENT  stu1;
就相当于struct student stu1;
上⾯的结构也可以直接定义为:
typedef struct
{
int age;
int score;
}STUDENT;
然后将STUDENT作为新类型使⽤,⽐如STUDENT  stu1;
typedef声明新的类型来代替已有的类型的名字。
如:
typedef int INTEGER;
下⾯两⾏等价
int i;
INTEGER i;
可以声明:
typedef struct
{
int age;
int score;
}STUDENT;
定义变量:
记住我
只能写成 STUDENT stu;
如果写成
typedef struct student
{
int age;
int score;
}STUDENT;
下⾯三⾏等价:
STUDENT stu;
struct student stu;
student stu;
1 #include <stdio.h>
2 #include <ctype.h>
3 #include <conio.h>
4
5void main()
6 {
7char letter;  // Letter typed by the user
8
9    printf("Do you want to continue? (Y/N): ");
10
11    letter = getch();          // Get the letter
12    letter = toupper(letter);  // Convert letter to uppercase
13
14while ((letter != 'Y') && (letter != 'N'))
15    {
16        putch(3);                  // Beep the speaker
17        letter = getch();          // Get the letter
18        letter = toupper(letter);  // Convert letter to uppercase
19    }
20
21    printf("\nYour response was %c\n", letter);
22 }