C enum的bump

C++ and some implementations of C permit enums larger than an int. The underlying type is bumped to an unsigned int, long int or unsigned long int, in that order.
AMD64 ABI Draft 1.0 – January 28, 2018 – 8:23

[root@VMTCA test]#./a.outsizeofabc=8sizeofabc1=4[root@VMTCA test]# catenum.c#include<stdio.h>enumabc{AB=10000000000000000,};enumabc1{AB1=1000000000};intmain(){printf("sizeof abc =%d\n",sizeof(enumabc));printf("sizeof abc1 =%d\n",sizeof(enumabc1));return0;}