/in/foo.c: In function 'main':
/in/foo.c:24:2: error: expected identifier or '(' before 'float'
  float min=0,
  ^~~~~
/in/foo.c:30:30: error: 'min' undeclared (first use in this function)
  printf("%.2f %.2f %.2f",max,min,ag);
                              ^~~
/in/foo.c:30:30: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:30:34: error: 'ag' undeclared (first use in this function)
  printf("%.2f %.2f %.2f",max,min,ag);
                                  ^~