C语言中联合体union的实例详解

union(int i, short s, char c) un; un.i = 3; printf(“i=%d”,un.i); printf(“length = %d/n”,sizeof(un);//==4，有最大的变量来决定

void swap(int *p , int *q){ int temp = *p; *p = *q; *q = temp; }

int i = 2; printf(“%#x”,&i);

int arr[] = {1,2,3,4}; int *p = &arr; prinft(“%d/n”, *(p+0)); prinft(“%d/n”, *(p+1));