foo.c: In function 'main':
foo.c:9:11: error: invalid operands to binary << (have 'int (*)(const char * restrict, ...)' and 'char *')
    9 |     printf<<"xiao wang shi huai dan"<<endl;
      |     ~~~~~~^~
      |     |     |
      |     |     char *
      |     int (*)(const char * restrict, ...)
foo.c:9:39: error: 'endl' undeclared (first use in this function)
    9 |     printf<<"xiao wang shi huai dan"<<endl;
      |                                       ^~~~
foo.c:9:39: note: each undeclared identifier is reported only once for each function it appears in
foo.c:12:11: error: invalid operands to binary << (have 'int (*)(const char * restrict, ...)' and 'char *')
   12 |     printf<<"xiao gu shi hao ren"<<endl;
      |     ~~~~~~^~
      |     |     |
      |     |     char *
      |     int (*)(const char * restrict, ...)

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