C语言程序设计万年历

#include <stdioh>

int leap (int year)

{if(year%4==0&&year%100!=0||year%400==0) //判断是否是闰年

return 1;

else return 0;

}

int days_month (int month,int year) //判断大月和小月

{

if(month==1||month==3||month==5||month==7||month==8||month==10||month==12) //找出大月

return 31;

if(month==4||month==6||month==9||month==11) //找出小月

return 30;

if(month==2&&leap(year)==1) return 29; //判断二月是29天还是29天

else return 28;

}

int firstday(int month,int year)

{int w;

w=(1+2month+3(month+1)/5+year+year/4+year/400-year/100)%7+1; //判断每个月开始的第一天是星期几

return w;

}

main()

{int i,j=1,k=1,a,b,month,year;

printf("\n input month and year:\n");

scanf("%d%d",&month,&year); //输入月和年

b=days_month(month,year);

a=firstday (month,year);

printf(" Sun Mon Tue Wed Thu Fri Sat \n"); //输出对应当月的日历

if(a==7)

{for(i=1;i<=b;i++)

{printf("%4d",i);

if(i%7==0)

{printf("\n");

}

}

}

if(a!=7)

{while (j<=4a)

{printf(" ");

j++;

}

for(i=1;i<=b;i++)

{printf("%4d",i);

if(i==7k-a)

{printf("\n");

k++;

}

}

}

printf("\n");

}

#include"stdioh"

void print(int);//函数声明

int dobb(int);

int date(int,int,int);

void main()

{

int year=0;

printf("输入打印的年份(XXXX)\n");

scanf("%d",&year);

print(year);

}

int dobb(int year)//闰年判断

{

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

return(1);

else return(0);

}

int date(int year,int month,int day)//判断该年某月某日是星期几的计算

{

int leap,cn=0,sum;//cn计算的是从该年1月1日起，到达这一天的天数总和

leap=dobb(year);

switch(month-1)

{

case 11:cn+=30;

case 10:cn+=31;

case 9:cn+=30;

case 8:cn+=31;

case 7:cn+=31;

case 6:cn+=30;

case 5:cn+=31;

case 4:cn+=30;

case 3:cn+=31;

case 2:if(leap) cn+=29;

else cn+=28;

case 1:cn+=31;

default:cn+=day;

}

sum=year-1+(year-1)/4-(year-1)/100+(year-1)/400+cn;//这是核心的一条公式，返回值是星期几(没有为什么)

return(sum%7);

}

void print(int year)//打印的核心算法

{

int i,j,n,leap,days,k,count;

leap=dobb(year);//判断是否闰年

days=date(year,1,1);//计算该年第一天是星期几

printf("%d年\n",year);

for(i=1;i<=12;i++)

{

printf("%3d月份\n",i);

printf("\n");

printf("\t");

printf("%-8s%-8s%-8s%-8s%-8s%-8s%-8s\n","Sun","Mon","Tues","Wed","Thurs","Fri","Sat");

if(days==7)

{

days=0;n=days;

}

else n=days;

printf("\t");

for(j=1;j<=8days;j++)

printf(" ");

switch(i)

{

case 1:

case 3:

case 5:

case 7:

case 8:

case 10:

case 12:count=31;break;

case 4:

case 6:

case 9:

case 11:count=30;break;

case 2:if(leap) count=29;

else count=28; break;

}

for(k=1;k<=count;k++)//以下代码是控制界面的对齐

{

printf("%-8d",k);

n++;

if(n==7)

{printf("\n");printf("\t");n=0;}

}

printf("\n\n");

days=n;

}

}

#include<stdioh>

#include<timeh>

int leap (int year)//判断闰年

{

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

return 1;

else return 0;

}

int days_month (int month,int year)//判断月

{

if(month==1||month==3||month==5||month==7||month==8||month==10||month==12)

return 31;

if(month==4||month==6||month==9||month==11)

return 30;

if(month==2&&leap(year)==1) return 29;

else return 28;

}

int firstday(int month,int year)//判断年

{

int w;

w=(1+2month+3(month+1)/5+year+year/4+year/400-year/100)%7+1;

return w;

}

main()

{

//调用系统时间

time_t tval;

struct tm now;

tval = time(NULL);

now = localtime(&tval);

printf("现在时间: %4d年 %d月 %02d日 %d:%02d:%02d\n", now->tm_year+1900, now->tm_mon+1, now->tm_mday,

now->tm_hour, now->tm_min, now->tm_sec);

//调用结束

int i,j=1,k=1,a,b,month,year;

b=days_month(now->tm_mon+1,now->tm_year+1900);

a=firstday (now->tm_mon+1,now->tm_year+1900);

printf(" Sun Mon Tue Wed Thu Fri Sat \n");

if(a==7)

{

for(i=1;i<=b;i++)

{

printf("%4d",i);

if(i%7==0)

{

printf("\n");

}

}

}

if(a!=7)

{

while (j<=4a)

{

printf(" ");

j++;

}

for(i=1;i<=b;i++)

{

printf("%4d",i);

if(i==7k-a)

{

printf("\n");

k++;

}

}

}

printf("\n");

}

# include <stdioh>

# include <mathh>

void printmonth(int m);

void printhead(int m);

int daysofmonth(int m);

int firstday(int y);

int year,weekday;

void main()

{

int i;

printf("请输入年份：");

scanf("%d",& year);

weekday=firstday(year);

printf("\n\n");

printf(" %d年\n",year);

for(i=1;i<=12;i++)

{

printmonth(i);

printf("\n");

}

printf("\n\n");

}

void printmonth(int m) //打印每月日历

{

int i,days;

printhead(m);

days=daysofmonth(m);

for(i=1;i<=days;i++)

{

printf("%5d",i);

weekday=(weekday+1)%7;

if (weekday==0) printf("\n ");

}

}

void printhead(int m) //打印每月的日历头（判定起始位置）

{

int i;

printf("\n%d月 日 一 二 三 四 五 六\n",m);

printf(" ");

for(i=0;i<weekday;i++)

printf(" ");

}

int daysofmonth(int m) //每月的天数

{

switch (m)

{

case 1:

case 3:

case 5:

case 7:

case 8:

case 10:

case 12:return 31;

case 4:

case 6:

case 9:

case 11:return 30;

case 2:if (((year%4==0 && year%100!=0)||year%400==0))

return 29;

else

return 28;

default: return 0;

}

}

int firstday(int y) //判断某年元旦是星期几

{

double s ;

s=floor(year-1+(year-1)/40-(year-1)/1000+(year-1)/4000+1);

return (int)s%7;

}

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