C语言初阶：结构体，联合体，枚举，类型重命名_c语言怎么重命名数组名字

1. 结构体

1.1 结构体的基本用法

结构体的使用：

#include <stdio.h>

struct Point{
   
        int x;
        int y;
        int z;
};

void PrintPoint(struct Point m){
   
        printf("(%d,%d,%d)\n",m.x,m.y,m.z);
}

void PrintPointPtr(struct Point* p){
   
        printf("(%d,%d,%d)\n",p->x,p->y,p->z);
}

int main(){
   
        struct Point a = {
   1,2,3};
        //结构体打印方法
        printf("(%d,%d,%d)\n",a.x,a.y,a.z);
        //结构体传参
        PrintPoint(a);
        //结构体输入
        scanf("%d%d%d",&a.x,&a.y,&a.z);
        PrintPoint(a);
        //结构体指针
        printf("&a = %p\n",&a);
        struct Point* p = &a;
        printf("p = %p\n",p);
        //结构体指针解引用
        printf("x = %d\n",(*p).x);
        printf("y = %d\n",(*p).y);
        printf("z = %d\n",(*p).z);
        //结构体指针解引用简写
        printf("x = %d\n",p->x);
        printf("y = %d\n",p->y);
        printf("z = %d\n",p->z);
        //结构体指针传参
        PrintPointPtr(p);
}
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结果为：

(1,2,3)
(1,2,3)
4 5 6
(4,5,6)
&a = 0x7ffd84170d6c
p = 0x7ffd84170d6c
x = 4
y = 5
z = 6
x = 4
y = 5
z = 6
(4,5,6)
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结构体可以直接赋值操作

1.2 结构体和数组

对结构体数组输出，qsort 排序结构体数组排序：

#include <stdio.h>
#include <stdlib.h>

struct Point{
   
        int x;
        int y;
        int z;
};

void PrintPoint(struct Point p){
   
        printf("(%d,%d,%d)\n",p.x,p.y,p.z);
}

void PrintPointPtr(struct Point* p){
   
        printf("(%d,%d,%d)\n",p->x,p->y,p->z);
}

int cmp(const void* a,const void* b){
   
        struct Point* p = (struct Point*)a;
        struct Point* q = (struct Point*)b;
        return p->y <
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