我一直收到这个错误
box2.c: In function 'printchars':
box2.c:26:4: warning: passing argument 1 of 'printf' makes pointer from integer without a
cast [enabled by default]
/usr/include/stdio.h:363:12: note: expected 'const char * __restrict__' but argument is
of type 'char' box2.c:26:4: warning: format not a string literal and no format arguments [-Wformat-security]
box2.c:39:8: warning: passing argument 1 of 'printf' makes pointer from integer without a cast [enabled by default]
/usr/include/stdio.h:363:12: note: expected 'const char * __restrict__' but argument is of type 'char'
box2.c:39:8: warning: format …