杭电2031进制转换

 1 #include <stdio.h>
 2 #include <string.h>
 3 #include <cmath>
 4 int a[32];
 5 int main()
 6 {
 7     int N, R, k;
 8     while(~scanf("%d%d", &N, &R))
 9     {
10         k = 0;
11         //memset(a, 0, sizeof(a));
12         if(R > 16 || R < 2 || R == 10)
13             continue;
14         if(N < 0)    printf("-");
15         while(N)
16         {
17             a[k++] = abs(N%R);
18             N = abs(N/R);
19         }
20         if(R < 10)
21         {
22             for(int j = k-1; j >= 0; j--)
23                 printf("%d", a[j]);
24         }
25         else
26         {
27             for(int j = k - 1; j >= 0; j--)
28                 printf("%X",a[j]);//以十六进制输出 
29         }
30         printf("\n");
31     }
32     return 0;
33 }