/in/foo.c: In function 'main':
/in/foo.c:6:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[5]' [-Wformat=]
    6 |     scanf("%s",&d);
      |            ~^  ~~
      |             |  |
      |             |  char (*)[5]
      |             char *
/in/foo.c:16:18: warning: implicit declaration of function 'sqrt' [-Wimplicit-function-declaration]
   16 |         x[0]=(-b-sqrt(e))/(2*a);
      |                  ^~~~
/in/foo.c:2:1: note: include '<math.h>' or provide a declaration of 'sqrt'
    1 | #include <stdio.h>
  +++ |+#include <math.h>
    2 | int main()
/in/foo.c:16:18: warning: incompatible implicit declaration of built-in function 'sqrt' [-Wbuiltin-declaration-mismatch]
   16 |         x[0]=(-b-sqrt(e))/(2*a);
      |                  ^~~~
/in/foo.c:16:18: note: include '<math.h>' or provide a declaration of 'sqrt'
/in/foo.c:21:38: warning: incompatible implicit declaration of built-in function 'sqrt' [-Wbuiltin-declaration-mismatch]
   21 |         printf("%.2f-%.2fi\n",-b/2/a,sqrt(-e)/2/a);
      |                                      ^~~~
/in/foo.c:21:38: note: include '<math.h>' or provide a declaration of 'sqrt'