【c学习-4】

//递归函数，调用自身

#include<stdio.h>

int fibFunc(int n)

{

    if(n== || n==){

        return ;

    }else{

        return fibFunc(n-)+fibFunc(n-);

    }

}

int main(){

    int n=fibFunc();

    printf("n=%d\n",n);

}

#include<stdio.h>

void Function(){

    printf("%s",__func__);

}

int main(){

    Function();

}

#include<stdio.h>

void Function(){

    static int i=;//静态局部变量定义

    printf("i=%d\n",i++);

}

int main(){

    int j=;

    for (j=;j<;j++){

        Function();

    }

}

int main(){

    const int x=;//使变量只读

//    x=2;

    printf("%d\n",x);

}

#include<stdio.h>

int main(){

    int *p;

    int a=;

    p=&a;

    *p=NULL;

    printf("p=%p\n",p);

    printf("*p=%d\n",*p);

    printf("&a=%p\n",&a);

    printf("a=%d\n",a);

    void *p1=&a;

    * int(*)p1=;

}

i nt c=;

    //int const *p4;

    //const int *p4;     //const在指针的左边，可以改变指针的指向，不可以改变指针的值；

    //int *const p4;    //const在指针的右边，不可以改变指针的指向，可以改变指针的值；

    //const int *const p4;//特殊具有两个const,使指向和值都为只读;

    p4=&c;

    //*p4=20;

    int arry[]={,,,,,,,,,};

    int *p1=&arry[];

    int *p2=&arry[]　　;

    long number=p2-p1;

    printf("number=%d\n",number);

    int x=;

    int *p=&x;

    printf("*p=%p\n",*p);

    printf("*p+1=%p\n",*p+);    //指针运算

}

#include<stdio.h>

int main(){

/*

struct People liupeng ;

liupeng.age=18;

//printf("%d\n",Pepole.numer);

strcpy(liupeng.name,"liupeng");

printf("%s\n",liupeng.name);

//printf("%d\n",liupeng.age);

*/                    //结构体

/*

    struct Pepole{

    int id;

    char name;

    char sex;

    double age;

};

struct Pepole x;

x.id=18;

x.name='lp';

printf("x.id=%d\n",x.id);

*/                  //使用结构体变量访问结构体元素

struct Pepole{

    int age;

    char name;

};

struct Pepole* p;

struct Pepole x={，"lp"};

p=&x;

printf("p->name=%s\n",p->name);

//p->id

}

#include<stdio.h>

    struct People {

        int age;

        char* name;

    };

    union libray{

        char name;

        int id;

    };

enum ABCColor {

    Red,

    Blue,

    White

};

int main(){

    enum ABCColor myColor;   //枚举型

    myColor=Red;

    myColor=Blue;

    myColor=White;

    printf("myColor=%d\n",myColor);

    struct People* p;

    struct People x={,"lp"};

     p=&x;

    printf("p->name=%s\n",p->name);  //使用结构体指针访问成员

    printf("p->age=%d\n",p->age);

    printf("x.name=%s\n",x.name);    //使用结构体变量访问成员

    union libray y;       //联合体

    y.name="poem";

    printf("y.name=%s\n",y.name);

} 

#ifndef SeqList_h  //用户自定义库文件

#define SeqList_h

#include<stdio.h>

struct SeqList{

    int dataArray[];

    int nLength;

};

typedef int dataType;

#endif

#include<stdio.h>
#include "SeqList.h"
int main(){
dataType myAge=18;
printf("myAge=%d\n",myAge);
return 0;
}