C语言指针存储连续空间

#include <iostream>
#include <stdio.h>
using namespace std;

struct  Test{
    int b;
    char a;
};

int main() {
    //定义结构
    Test test[3]={{100,'a'},{100,'b'},{100,'c'}};
    //将结构体数据转万能指针
    void *voidBuff=(void *)test;
    char *charBuff=(char *)voidBuff;
    //打印指针byte内容
    for(int i=0;i<sizeof(struct  Test)*3;i++)
    {
        printf("%d\n",*charBuff);
        charBuff++;
    }
    //将万能指针存储文件
    FILE  * out=fopen("1.bin","wb");
    fwrite(voidBuff,sizeof(struct Test),3,out);
    fclose(out);
   return 0;
}