c++,题目我看不懂得,希望有朋友能简单讲解下

有点错：应该这样#include unsigned fun6(unsigned num) //定义 fun6这个函数（无符号类型）{ unsigned k=1;do //do的循环结构;while(num)：为假时(0)结束{k*=num%10; num/=10; //k=k*(num%10) ; num=num/10;}while (num);return k;}void main(){ unsigned n=26;printf("%d\n",fun6(n)); //输出并调用fun6(n)}