【笔试题】整型提升加法

在X86，vc++6.0环境下，有下列程序

#include<stdio.h>int main(){	char c;	unsigned char uc;	unsigned short us;	c = 128;	uc = 128;	us = c + uc;	PRintf("0x%x  ", us);	us = (unsigned char)c + uc;	printf("0x%x  ", us);	us = c + (char)uc;	printf("0x%x  ", us);	system("pause");	return 0;}
如何计算看下图：