进制转换

#include<stdio.h>
#define M 2

unsigned process(unsigned n)
{
static unsigned S=1;
unsigned d,e;
d=n/M;
if(d==0)
e=1;
else
{
S*=M;
e=M*process(d);
}
if (e==1) printf("(");
printf("%d",n%M);
if (S==e) printf(")%d\n",M);
return(e);
}

void main()
{
unsigned num;
scanf("%u",&num);
printf("(%u)10 = ",num);
process(num);
}