数字输入输出挂

int Scan(){    int res=0,ch,flag=0;    ch=getchar();    while(ch=='\n'||ch==' ') ch=getchar();    if(ch=='-')        flag=1;    else if(ch>='0'&&ch<='9')        res=ch-'0';    while((ch=getchar())>='0'&&ch<='9')        res=res*10+ch-'0';    return flag?-res:res;}void Out(int a) {    if(a>9)        Out(a/10);    putchar(a%10+'0');}