C语言实现任意进制的转换，主要注意代码的小技巧

#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);
}