foo.cc: In function ‘int main()’:
foo.cc:5:18: warning: ‘n’ is used uninitialized [-Wuninitialized]
    5 |         double n,x=n;
      |                  ^
foo.cc:5:16: note: ‘n’ declared here
    5 |         double n,x=n;
      |                ^

正在同步测试数据，请稍后