C语言实现一个数的二进制位的倒位

#include<stdio.h>
unsigned int reverse_bit(unsigned int con,int i)
{
    if (i <= 31)
    {
        unsigned int tmp = con;
        tmp = tmp >> i;
        tmp = tmp << 31;
        tmp = tmp >> 31;
        tmp=tmp << (31 - i);
        i++;
        return tmp + reverse_bit(con,i);
    }
    else
        return 0;
}
int main()
{
    unsigned int k = 25;
    int j = 0;
    int value =reverse_bit(k,j);
    printf("%d\n", value);
    return 0;
}