C语言快速回忆书签
1、编程开始
#include
#include
int main()
{
return 0;
}
return 0,将cpu使用权交个操作系统，int 返回一个整型.
2、输入输出
#include#include
int main()
{
int i ,j,h[10];
printf("please input 10 numbers:");
for(i=0;i<10;i++)
{
scanf("%d",&h[i]) ;
}
for(j=0;j<10;j++)
{
printf("%d",h[j]) ;
}
return 0;
}
3、函数调用
#include/* function declaration */ int max(int num1, int num2);int main () {/* local variable definition */int a = 100;int b = 200;int ret;/* calling a function to get max value */ret = max(a, b);printf( "Max value is : %d\n", ret );return 0; }/* function returning the max between two numbers */ int max(int num1, int num2) {/* local variable declaration */int result;if (num1 > num2)result = num1;elseresult = num2;return result; }
4、指针使用
#includeint main () {int var = 20; /* actual variable declaration */int *ip; /* pointer variable declaration *///这里是定义ip = &var; /* store address of var in pointer variable*/printf("Address of var variable: %x\n", &var );/* address stored in pointer variable */printf("Address stored in ip variable: %x\n", ip );/* access the value using the pointer */printf("Value of *ip variable: %d\n", *ip );//这里是求指针的值return 0; }
指针调用结构体
#include#include struct Books {char title[50];char author[50];char subject[100];int book_id; };/* function declaration */ void printBook( struct Books *book ); int main( ) {struct Books Book1; /* Declare Book1 of type Book */struct Books Book2; /* Declare Book2 of type Book *//* book 1 specification */strcpy( Book1.title, "C Programming");strcpy( Book1.author, "Nuha Ali"); strcpy( Book1.subject, "C Programming Tutorial");Book1.book_id = 6495407;/* book 2 specification */strcpy( Book2.title, "Telecom Billing");strcpy( Book2.author, "Zara Ali");strcpy( Book2.subject, "Telecom Billing Tutorial");Book2.book_id = 6495700;/* print Book1 info by passing address of Book1 */printBook( &Book1 );/* print Book2 info by passing address of Book2 */printBook( &Book2 );return 0; }void printBook( struct Books *book ) {printf( "Book title : %s\n", book->title);printf( "Book author : %s\n", book->author);printf( "Book subject : %s\n", book->subject);printf( "Book book_id : %d\n", book->book_id); }
#include
#include
int add(int x);
int main()
{ int (*fun)()=add;printf("%d",(*fun)(1));return 0;
}int add(int x){return x+1;}
拓展阅读：嵌入式笔试题：http://blog.sina.com.cn/s/blog_9f149699010133xz.html
6、结构体声明
struct {
int a;
char b;
float c;
} x，y[20],*z;
x，y[20],*z为变量。
struct SIMPLE {
int a;
char b;
float c;
} ;
这个声明把标签SIMPLE和这个成员列表联系在一起，该声明并没有提供变量列表，所以并未创建任何变量。
创建变量：
struct SIMPLE x;
struct SIMPLE y[20],*z;
采用typedef
typedef struct {
int a;
char b ;
float c;
}Simple;
Simple x;
Simple y[20], *z;
举例子： CC2530
typedef struct
{
osal_event_hdr_t hdr; /* OSAL Message header */
uint16 groupId; /* Message's group ID - 0 if not set */
uint16 clusterId; /* Message's cluster ID */
afAddrType_t srcAddr; /* Source Address, if endpoint is STUBAPS_INTER_PAN_EP,
it's an InterPAN message */
uint16 macDestAddr; /* MAC header destination short address */
uint8 endPoint; /* destination endpoint */
uint8 wasBroadcast; /* TRUE if network destination was a broadcast address */
uint8 LinkQuality; /* The link quality of the received data frame */
uint8 correlation; /* The raw correlation value of the received data frame */
int8 rssi; /* The received RF power in units dBm */
uint8 SecurityUse; /* deprecated */
uint32 timestamp; /* receipt timestamp from MAC */
uint8 nwkSeqNum; /* network header frame sequence number */
afMSGCommandFormat_t cmd; /* Application Data */
} afIncomingMSGPacket_t;
定义一个变量：
afIncomingMSGPacket_t *MSGpkt;
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