/in/foo.c: In function 'main':
/in/foo.c:11:18: error: 'le' undeclared (first use in this function)
   11 |         if(delta>le-6)
      |                  ^~
/in/foo.c:11:18: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:14:40: error: 'q' undeclared (first use in this function)
   14 |                 x2=(-b-sqrt(delta))/(2*q);
      |                                        ^
/in/foo.c:27:32: warning: unknown conversion type character ',' in format [-Wformat=]
   27 |                 printf("%.2lf+%,2lfi\n",real,imag);
      |                                ^
/in/foo.c:27:24: warning: too many arguments for format [-Wformat-extra-args]
   27 |                 printf("%.2lf+%,2lfi\n",real,imag);
      |                        ^~~~~~~~~~~~~~~~
/in/foo.c:28:32: warning: unknown conversion type character ',' in format [-Wformat=]
   28 |                 printf("%.2lf-%,2lfi\n",real,imag);
      |                                ^
/in/foo.c:28:24: warning: too many arguments for format [-Wformat-extra-args]
   28 |                 printf("%.2lf-%,2lfi\n",real,imag);
      |                        ^~~~~~~~~~~~~~~~
/in/foo.c:32:9: error: expected declaration or statement at end of input
   32 |         return 0;
      |         ^~~~~~