/in/foo.c: In function 'main':
/in/foo.c:12:13: error: stray '\357' in program
  if(delter=0）
             ^
/in/foo.c:12:14: error: stray '\274' in program
  if(delter=0）
              ^
/in/foo.c:12:15: error: stray '\211' in program
  if(delter=0）
               ^
/in/foo.c:13:2: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
  {
  ^
/in/foo.c:13:2: error: expected ')' before '{' token
/in/foo.c:30:1: error: expected expression before '}' token
 }
 ^
/in/foo.c:5:27: warning: unused variable 'x2' [-Wunused-variable]
     float a,b,c,delter,x1,x2;
                           ^~