/in/foo.c: In function 'main':
/in/foo.c:4:15: warning: too many arguments for format [-Wformat-extra-args]
    4 |         scanf("1f",&f);
      |               ^~~~
/in/foo.c:6:27: error: expected ';' before '\U0000ff1b'
    6 |         printf("%21f\n",c)；
      |                           ^~
      |                           ;