C++字符串读入

 int read()
 {
     int x=,f=;char ch=getchar();
     while (ch<''||ch>''){if(ch=='-')f=-;ch=getchar();}
     while (ch>=''&&ch<=''){x=x*+ch-'';ch=getchar();}
     return x*f;
 }
 int main()
 {
   n=read();
   scanf("%s",ch+);
   for(i=;i<=n;i++) printf("%c",ch[i]);
   return ;
 }