在Linux GCC编译测试通过，代码如下：
#include <stdio.h>
void tobase(int, int);
int main()
{
tobase(33, 16);
return 0;
}
void tobase(int value, int base)
{
static char digits[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
char buf[(sizeof(long) << 3) + 1];
char *ptr, *end;
if (base < 2 || base > 36) {
printf("error base range \n");
}
end = ptr = buf + sizeof(buf) - 1;
*ptr = '\0';
do {
*--ptr = digits[value % base];
value /= base;
} while (ptr > buf && value);
printf("base: %d, => %s \n", base, ptr);
}