【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;
}