c语言万年历程序

#include

#include

#include

int leap (int year) ;//判断是否为闰年

int days_month (int month,int year) ;//判断这个月的天数

int menu_select();

/*void f()

{

int day,month,year,sum,leap,S;

printf("\n请输入年月日\n");

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

switch(month)

{

case 1:sum=0;break;

case 2:sum=31;break;

case 3:sum=59;break;

case 4:sum=90;break;

case 5:sum=120;break;

case 6:sum=151;break;

case 7:sum=181;break;

case 8:sum=212;break;

case 9:sum=243;break;

case 10:sum=273;break;

case 11:sum=304;break;

case 12:sum=334;break;

default:printf("data error");break;

}

sum=sum+day;

if(year%400==0||(year%4==0&&year%100!=0))

leap=1;

else leap=0;

if(leap==1&&month>2)

sum++;

S=(year-1+(year-1)/4-(year-1)/100+(year-1)/400+sum)%7;

//X表示年份,C是该年份元旦开始到这一日的天数

//S/7的系数就是星期数

//01printf("%d",S);

switch(S)

{

case 1:printf("星期一\n");break;

case 2:printf("星期二\n");break;

case 3:printf("星期三\n");break;

case 4:printf("星期四\n");break;

case 5:printf("星期五\n");break;

case 6:printf("星期六\n");break;

case 0:printf("星期日\n");break;

}

}

*/

int Leap(int year)

{ int leap;

if(year%400==0||(year%4==0&&year%100!=0))

leap=1;

else leap=0;

return leap;

}

int SU(int sum,int year)

{int S;

S=(year-1+(year-1)/4-(year-1)/100+(year-1)/400+sum)%7;

return S;

}

int Sum(int year,int month,int day=1)

{int sum,leap;

switch(month)

{

case 1:sum=0;break;

case 2:sum=31;break;

case 3:sum=59;break;

case 4:sum=90;break;

case 5:sum=120;break;

case 6:sum=151;break;

case 7:sum=181;break;

case 8:sum=212;break;

case 9:sum=243;break;

case 10:sum=273;break;

case 11:sum=304;break;

case 12:sum=334;break;

default:printf("data error");break;

}

sum=sum+day;

leap=Leap(year);

if(leap==1&&month>2)

sum++;

return sum;

}

void Print(int S)

{

switch(S)

{

case 1:printf("星期一\n");break;

case 2:printf("星期二\n");break;

case 3:printf("星期三\n");break;

case 4:printf("星期四\n");break;

case 5:printf("星期五\n");break;

case 6:printf("星期六\n");break;

case 0:printf("星期日\n");break;

}

}

void Fun1()

{

int