# include <stdio.h>
# include <string.h>
char *day_name(int n);

main(void)
{
  int i;
  char *day_name(int n); //这个算是函数, 还是别的  
  printf("input Day No:\n");
  scanf("%d",&i);
//  if(i<0)
//      exit(1);
  printf("Day No:%2d-->%s\n",i,day_name(i));
}
char *day_name(int n){
  static char *name[]={ "Illegal day",  
                        "Monday",
                        "Tuesday",
                        "Wednesday",
                        "Thursday",
                        "Friday",
                        "Saturday",
                        "Sunday"};
  return((n<1||n>7) ? name[0] : name[n]);//这个是什么意思,是如何反回并输出的
}    name[0] : namel[n]

[ 本帖最后由 cuijingchun 于 2012-1-18 17:28 编辑 ]