逻辑移位与算术移位

#include <conio.h>
#include <stdio.h>  
int fun1 (unsigned word)
{
    return (int) ((word << 24) >> 24); 
}  

int fun2 (unsigned word)
{
    return ((int) word << 24) >>24;
}
int main()   
{    
     unsigned  a;
     while(1)
     {
           scanf("%d",&a);
           printf("%d,%d/n",fun1(a),fun2(a));
     }
     getch();
     return 0;
}