T037 高低交换

#include<stdio.h>

inline int xchg(unsigned char n)//这种是利用位运算
{
    char up = n << 4;
    char low = n >> 4;
    char a=up+low;
    return a;
}

inline int xchg(unsigned char n)//这种是直接利用二进制特性
{
    char a;
    a=n%16*16+n/16;
    return a;
}

int main()
{
    unsigned char n;
    scanf("%d", &n);
    n=xchg(n);
    printf("%d\n", n);
    return 0;
}