十进制（0~2147483647）转任意进制（2进制~16进制）。

#include <stdio.h>

void main() {
    int num, radix, i = 0;
    char res[32] = {'0'}, table[] = "0123456789ABCDEF";
    printf("Please enter the value to be converted:");
    scanf("%d", &num);
    printf("Please enter the radix to be converted:");
    scanf("%d", &radix);
    if (num == 0)
        i = 1;
    while (num > 0) {
        res[i++] = table[num % radix];
        num = num / radix;
    }
    printf("Result:");
    while (--i >= 0)
        printf("%c", res[i]);
}