火柴棒拼最大数和最小数

题目：n根火柴棒，能组成最大的数是多少？最小的正整数是多少？

#include 
int main()
{
    int n,m,bg,i;
    while(scanf("%d",&n)==1)
    {
        m=n;
        bg = 1;
        while(m!=0)
        {
            if(m<=7)
            {
                switch(m)
                {
                    case 2: printf("1"); break;
                    case 3: printf("7"); break;
                    case 4: printf("4"); break;
                    case 5: printf("2"); break;
                    case 6: if(bg) printf("6"); else printf("0"); break;
                    case 7: printf("8"); break;
                }
                m=0;
            }
            else
            {
                switch(m%7)
                {
                    case 1: printf("10"); m-=8; break;
                    case 2: printf("1"); m-=2; break;
                    case 3:
                    case 4:
                    case 5: if(bg) {printf("2"); m-=5;} else {printf("0"); m-=6;} break;
                    case 6: if(bg) printf("6"); else printf("0"); m-=6; break;
                    case 0: printf("8"); m-=7; break;
                }
            }
            bg = 0;
        }
        printf(" ");
        if (n%2==0)
        {
            for (i=0;i