#include"stdio.h"
#include"math.h"
int leap(int year)
{
    if((year%4==0&&year%100!=0)||year%400==0)
     return 1;
    else
       return 0;
}
int days(int y,int m,int d)
{
    int i,j,sum=0,z;
     int ruun[12]={31,29,31,30,31,30,31,31,30,31,30,31};
     int ping[12]={31,28,31,30,31,30,31,31,30,31,30,31};
     z=leap(y);
    if(z==1)
     {


            for(i=0;i<m-1;i++)

                sum=sum+ruun[i];
            }


    else

{


          for(j=0;j<m-1;j++)

                sum=sum+ping[j];
            }
        sum=sum+d;

    return sum;
}
  main()
  {
      int days(int y,int m,int d)
      int year,month,day,n;
      printf("please input  year:month:day\n");
      scanf("%d%d%d,&year,&month,&day");
      getchar();
      n=days(year,month,day);
      printf("%d-%d-%d is the %d day of this year!,year,month,day,n");
      getchar();
  }

scanf("%d%d%d,&year,&month,&day");
=》scanf("%d%d%d",&year,&month,&day);

printf("%d-%d-%d is the %d day of this year!,year,month,day,n");
=>printf("%d-%d-%d is the %d day of this year!",year,month,day,n);

谢谢，另外int days(int y,int m,int d)后忘加；。