#include "stdio.h"
main()
{
struct {int y;int m;int d;}x,y;
int i,j;
while (1)
{printf ("Please Input Date (YYYY-MM-DD) : ");
scanf ("%d-%d-%d",&x.y,&x.m,&x.d);
if ((1000<=x.y&&x.y<=9999)&&(0<x.m&&x.m<=12)&&(0<x.d&&x.d<=31)==1) break;
printf ("Error Year or Month or Date.\n");}
if ((x.y%4==0)&&((x.y%400==0)||(x.y%100==1)==1))
{
switch (x.m-1)
{
case 0:i=0;break;
case 1:i=31;break;
case 2:i=59;break;
case 3:i=90;break;
case 4:i=120;break;
case 5:i=151;break;
case 6:i=181;break;
case 7:i=212;break;
case 8:i=243;break;
case 9:i=273;break;
case 10:i=304;break;
case 11:i=334;break;
case 12:i=365;break;
default:printf ("Error Month\n");}
j=i+x.d;
printf ("Date is : %d",j);}
else
{
switch (x.m-1)
{
case 0:i=0;break;
case 1:i=31;break;
case 2:i=60;break;
case 3:i=91;break;
case 4:i=121;break;
case 5:i=152;break;
case 6:i=182;break;
case 7:i=213;break;
case 8:i=244;break;
case 9:i=274;break;
case 10:i=305;break;
case 11:i=335;break;
case 12:i=366;break;
default:printf ("Error Month\n");}
j=i+x.d;
printf ("Date is : %d",j);}

多定义了一个Y的数据结构了...

我这样好像更易读一点,如果合在一块更不易读.

代码长度跟EXE文件大小是不是有关.?

#include "stdio.h"
main()
{
struct {int y;int m;int d;}x;
int i,j;
while (1)
{printf ("Please Input Date (YYYY-MM-DD) : ");
scanf ("%d-%d-%d",&x.y,&x.m,&x.d);
if ((1000<=x.y&&x.y<=9999)&&(0<x.m&&x.m<=12)&&(0<x.d&&x.d<=31)==1) break;
printf ("Error Year or Month or Date.\n");}
switch (x.m-1)
{
case 0:i=0;break;
case 1:i=31;break;
case 2:i=59;break;
case 3:i=90;break;
case 4:i=120;break;
case 5:i=151;break;
case 6:i=181;break;
case 7:i=212;break;
case 8:i=243;break;
case 9:i=273;break;
case 10:i=304;break;
case 11:i=334;break;
case 12:i=365;break;
default:printf ("Error Month\n");}
j=i+x.d;
if ((x.y%4==0)&&((x.y%400==0)||(x.y%100==1)==0))
j=j+1;
printf ("Date is : %d",j);}


^_^ 还可以优化么...

^_^ case 12 是多余的....


if ((x.y%4==0)&&((x.y%400==0)||(x.y%100==1)==0))

润年的条件是符合下列条件之一..
1.能被4整除且被400整除.
2.能被4整除且不被100整除.

i替换成j ,,^_^ ...的确可以.

^_^ 的确是,如果输入 4-31 多算一天了...^_^