数组循环存储覆盖

结构体赋值

#include <stdio.h>
#include <string.h>

typedef struct
{
	int num;
	char name[6];
	short height;
} STR_STU; 
int main()
{
	STR_STU xm = {0};
	STR_STU xh = {0};
	xm.num = 1000;
	xm.height = 169;
	memcpy(xm.name,"ad",4);
	printf("xm's big name: %sn",xm.name);
	xh = xm;
	printf("xh's big name: %sn",xh.name);
	printf("xh's num: %dn",xh.num);
	printf("struct.size: %dn",sizeof(xh));
	memset(&xh,0,sizeof(xh));
	printf("xh's big name: %sn",xh.name);
	printf("xh's num: %dn",xh.num);
	return 0;
}

循环

#include <stdio.h>
#include <string.h>

#define arraycap 20
typedef struct 
{
	int data[arraycap];
	short front;
	short count;
	//short rear;
} FOR_ARRAY;
FOR_ARRAY g_array={0};

void show() {for(int i=0;i<arraycap;++i)  printf("%d  ",g_array.data[i]);printf("n"); }
void insert(int num)
{
	short *count = &(g_array.count);
	short *front =&(g_array.front);
	printf("front:%dn",*front);
	printf("count:%dn",*count);
	if(*count == arraycap)
	{
		g_array.data[*front] = num;
		(*front)++;
		if(*front>=arraycap) *front = 0;
	}else
	{
		g_array.data[*count]= num;
		(*count)++;
	}
}

int main()
{
	for(int i=1;i<25;++i)
	{
		insert(i);
		show();
	}
	return 0;
}

最后

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