/in/foo.c: In function 'main':
/in/foo.c:8:24: error: 'sign' undeclared (first use in this function); did you mean 'sin'?
    8 |                 term = sign * (1.0 / denominator);
      |                        ^~~~
      |                        sin
/in/foo.c:8:24: note: each undeclared identifier is reported only once for each function it appears in