/in/foo.c: In function 'main':
/in/foo.c:18:22: error: invalid suffix "a" on integer constant
   18 |          {x1=x2=(-b)/2a;
      |                      ^~
/in/foo.c:19:28: error: expected ';' before '}' token
   19 |           printf("%.2f",x1)
      |                            ^
      |                            ;
   20 |           }
      |           ~