/in/foo.c: In function 'main':
/in/foo.c:26:27: warning: statement with no effect [-Wunused-value]
   26 |                 else(delta<0)
      |                     ~~~~~~^~~
/in/foo.c:26:30: error: expected ';' before '{' token
   26 |                 else(delta<0)
      |                              ^
      |                              ;
   27 |                 {
      |                 ~             
/in/foo.c:33:9: error: expected declaration or statement at end of input
   33 |         }
      |         ^
/in/foo.c:5:35: warning: unused variable 'i' [-Wunused-variable]
    5 |         float a,b,c,delta,x,x1,x2,i;
      |                                   ^