/in/foo.cc: In function 'int main()':
/in/foo.cc:9:31: error: expected ';' before 'if'
    9 |         ch=p*(p-a)*(p-b)*(p-c)
      |                               ^
      |                               ;
   10 |         if(a+b>c&&a+c>b&&c+b>a)
      |         ~~                     
/in/foo.cc:12:9: error: 'else' without a previous 'if'
   12 |         else
      |         ^~~~