代碼：
1 int Scan() //輸入外挂
2 {
3 int res=0,ch,flag=0;
4 if((ch=getchar())=='-')
5 flag=1;
6 else if(ch>='0'&&ch<='9')
7 res=ch-'0';
8 while((ch=getchar())>='0'&&ch<='9')
9 res=res*10+ch-'0';
10 return flag?-res:res;
11 }
12 void Out(int a) //輸出外挂
13 {
14 if(a>9)
15 Out(a/10);
16 putchar(a%10+'0');
17 } 參考自