/in/foo.c: In function 'main':
/in/foo.c:6:17: warning: format '%f' expects argument of type 'float *', but argument 2 has type 'double *' [-Wformat=]
    6 |         scanf("%f",&x);
      |                ~^  ~~
      |                 |  |
      |                 |  double *
      |                 float *
      |                %lf
/in/foo.c:12:19: warning: implicit declaration of function 'sqr' [-Wimplicit-function-declaration]
   12 |                 y=sqr(5*x+10);}
      |                   ^~~
/usr/bin/ld: /tmp/ccgLS4v6.o: in function `main':
foo.c:(.text.startup+0xb9): undefined reference to `sqr'
collect2: error: ld returned 1 exit status