foo.cc: In function 'int main()':
foo.cc:9:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    9 |  scanf("%d",&n);number=n*n;
      |  ~~~~~^~~~~~~~~
foo.cc:8:20: warning: 'n' is used uninitialized in this function [-Wuninitialized]
    8 |  int x,y,n,number=n*n;
      |                   ~^~

[Hydro](https://hydro.ac)提供评测服务