/in/foo.c: In function 'main':
/in/foo.c:9:3: error: 'term' undeclared (first use in this function)
   term=1/denominator;
   ^~~~
/in/foo.c:9:3: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:13:7: error: stray '\357' in program
  pi*=4；
       ^
/in/foo.c:13:8: error: stray '\274' in program
  pi*=4；
        ^
/in/foo.c:13:9: error: stray '\233' in program
  pi*=4；
         ^
/in/foo.c:14:5: error: expected ';' before 'printf'
     printf("%.8lf\n",pi);
     ^~~~~~