foo.c: In function 'main':
foo.c:16:43: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=]
   16 |                 printf(" 最后一位非零数是%d ", b);
      |                                          ~^    ~
      |                                           |    |
      |                                           int  long long int
      |                                          %lld
foo.c:18:34: warning: implicit declaration of function 'pow' [-Wimplicit-function-declaration]
   18 |                 for(c=1;c!=0;c=b/pow(10,n))
      |                                  ^~~
foo.c:2:1: note: include '<math.h>' or provide a declaration of 'pow'
    1 | #include <stdio.h>
  +++ |+#include <math.h>
    2 | 
foo.c:18:34: warning: incompatible implicit declaration of built-in function 'pow' [-Wbuiltin-declaration-mismatch]
   18 |                 for(c=1;c!=0;c=b/pow(10,n))
      |                                  ^~~
foo.c:18:34: note: include '<math.h>' or provide a declaration of 'pow'

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