c printf自动补0的办法

[celladmin@cell1 ~]$ ./a.out
a=004
[celladmin@cell1 ~]$ cat a.c
#include <stdio.h>

int main(int argc, char **argv)
{
  int   n = 3;
  int   a = 4;

  printf("a=%0*d\n", n, a);
  return (0);
}
[celladmin@cell1 ~]$ vi a.c
[celladmin@cell1 ~]$ vi a.c
[celladmin@cell1 ~]$ gcc a.c
[celladmin@cell1 ~]$ ./a.out
a=4111
[celladmin@cell1 ~]$ cat a.c
#include <stdio.h>

int main(int argc, char **argv)
{
  int   n = 3;
  int   a = 4111;

  printf("a=%0*d\n", n, a);
  return (0);
}