/in/foo.c: In function 'main':
/in/foo.c:12:2: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
  if(delter=0)
  ^~
/in/foo.c:15:17: error: 'x' undeclared (first use in this function)
   printf("%.2f",x);
                 ^
/in/foo.c:15:17: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:27:21: warning: format '%f' expects a matching 'double' argument [-Wformat=]
    printf("%.2f\n%.2f",x1)
                     ^
/in/foo.c:28:3: error: expected ';' before '}' token
   }
   ^