c语言循环语句必会八题

‘壹’ C语言编程题：移位函数，既能循环左移又能循环右移

#include<stdio.h>
#include<math.h>
unsignedfun(unsignednum,intn)
{
if(n>0)
{
//sizeof(unsigned)*8计算变量所占位数，如int型占32位
return(num>>(sizeof(unsigned)*8-n))|(num<<n);//先高位移动，再低位移动后，两者按位或，相当把低位溢出的又添加到了高位，实现了循环的效果
}
else
{
return(num<<(sizeof(unsigned)*8-abs(n)))|(num>>abs(n));
}
}
voidmain(void)
{
printf("%u
",fun(2,-34));
}