HDU 2031 进制转换

#include<stdio.h>
#include<stdlib.h>
int main()
{
int m,n,r,k,i,flag;
int a[1000];
while(scanf("%d%d",&n,&m)!=EOF)
{
k=0;flag=0;
if(n<0)
{
flag=1;
n=-n;
}
r=n%m;
while(n)
{
if(r<10)
a[k++]=r+48;
else if(r>=10)
a[k++]=r+55;
n=n/m;
r=n%m;
}
if(flag==1)
putchar('-');
for(i=k-1;i>=0;i--)
printf("%c",a[i]);
putchar('\n');
}
system("pause");
return 0;
}