指针的使用

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用指针函数输出年月日不要忘记声明函数记得返回结果

#include <stdio.h>
void month_day(int year,int yearday,int *pmonth,int *pday);
int main(void)
{
 int day,yearday,month,year;
 scanf(“%d %d”,&year,&yearday);
 month_day(year,yearday,&month,&day);
 printf(“%d-%d-%d”,year,month,day);
 return 0;}
void month_day(int year,int yearday,int *pmonth,int *pday)
{
 int k,leap;
 int a[2][13]={{0,31,28,31,30,31,30,31,31,30,31,30,31},
 {0,31,29,31,30,31,30,31,31,30,31,30,31},};
 leap=(year%4==0&&year0!=0)||year@0==0;
 for(k=1;yearday>a[leap][k];k )
  yearday-=a[leap][k];
 *pmonth=k;
 *pday=yearday;
}