/in/foo.c: In function 'main':
/in/foo.c:12:32: warning: implicit declaration of function 'power' [-Wimplicit-function-declaration]
   12 |                         x1=(-b+power(delta,0.5))/(2*a);
      |                                ^~~~~
/in/foo.c: At top level:
/in/foo.c:24:17: error: expected identifier or '(' before 'return'
   24 |                 return 0;
      |                 ^~~~~~
/in/foo.c:25:1: error: expected identifier or '(' before '}' token
   25 | }
      | ^