foo.cc: In function 'int getCount(int)':
foo.cc:11:18: warning: for increment expression has no effect [-Wunused-value]
   11 |   for(i=0; i ;a[i]){
      |               ~~~^
foo.cc:16:36: warning: format not a string literal and no format arguments [-Wformat-security]
   16 |     printf("总张数:%d\n" + count);
      |                                    ^
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/9/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x24): undefined reference to `main'
collect2: error: ld returned 1 exit status

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