指定四舍五入函数

/*
#include "stdio.h"
void main()
{
   long c = 0;
   unsigned short bb=1;
   bb =bb+ c;
   printf("bb=%d",bb);
}
错误信息：warning C4244:'=':conversion from 'long' to 'unsigned short',possible loss of data
错误原因：C4244警告：‘=’：从‘long’类型转换到‘unsignd short’类型，可能会造成数据丢失。
修改方法：*/
#include "stdio.h"
void main()
{
long c=0;
unsigned short bb=1;
bb=bb+(unsigned short)c;
printf("bb=%d",bb);
}