C： 共用体

共用体
https://www.runoob.com/cprogramming/c-unions.html

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

union Data
{
   int i;
   float f;
   char  str[20];
};

int main( )
{
   union Data data;

   data.i = 10;
   printf( "data.i : %d\n", data.i);

   data.f = 220.5;
   printf( "data.f : %f\n", data.f);

   strcpy( data.str, "C Programming");
   printf( "data.str : %s\n", data.str);

   return 0;
}

来源：CSDN

作者：hahahafree

链接：https://blog.csdn.net/weixin_43731793/article/details/103674091