c_cpp 指向c中的联盟

Posted 2021-05-14

#include "stdio.h"

//addressing a spot in a union

union foo {
  int i;
  char c;
};

int main(void) {
  union foo tester;
  tester.i = 6;
  int* ipnt = &tester.i;
  printf("The address of the int union is %p\n", ipnt);
  *ipnt = 4;
  printf("The value has been changed to %d\n", tester.i);
  return 0;
}