foo.cc: In function ‘int main()’:
foo.cc:13:21: error: expected primary-expression before ‘)’ token
   13 |                 if( )
      |                     ^
foo.cc:14:9: error: expected primary-expression before ‘}’ token
   14 |         }
      |         ^
foo.cc:10:16: warning: unused variable ‘sum’ [-Wunused-variable]
   10 |         double sum=n*0.1;
      |                ^~~

正在同步测试数据，请稍后