EEPW论坛

/* Note:Your choice is C IDE */
#include "stdio.h"
void screen();  
void whatisit();  
void leapyear();  
void printyearday();  
int IsLeapYear(int);  
int whatisita(int,int);  
int everymonth(int,int);  
void printmonth(int,int);  
void printmonthday();  
char*week[]={"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};  
void main()  
{  
    screen();  
}  
void screen()  
{  
    int n;    
    while(1)    
    { printf("  万年历查询程序:\n");    
      printf("1.查询某年某月某日是星期几\n");    
      printf("2.查询某年是否是闰年
");    
      printf("3.打印某年的全年日历
");    
      printf("4.查询某月的最大天数
");    
      printf("5.退出
");    
      printf("My ID:2013304109\n");
      printf("请输入要查询的选项:");    
      scanf("%d",&n);    
      switch(n)    
      {    
        case 1:whatisit();break;    
        case 2:leapyear();break;    
        case 3:printyearday();break;    
        case 4:printmonthday();break;    
        case 5:return;    
        default:printf("你输入错误，请按要求输入!!!\n");break;    
      }    
    }    
}    
void whatisit()    
{    
    int y,m,d,s,k=1,sum,n,i;    
    char yn;    
    int a[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};    
    while(k)    
    {    printf("请依次输入年,月,日:\n");    
        scanf("%d,%d,%d",&y,&m,&d);    
        s=0;    
        for(i=1;i<m;i++)    
          s=s+a[i];    
          s=s+d;    
          if(IsLeapYear(y)&&m>2)s=s+1;    
          sum=s;    
          n=(y-1+(y-1)/4-(y-1)/100+(y-1)/400+sum)%7;    
          printf("这天是%s\n",week[n]);    
          printf("是否继续查询(Y/N)?");    
          scanf("%c",&yn);    
          getchar();    
          if(yn=='y'||yn=='Y')k=1;    
          else k=0;    
    }    
}    
    
int IsLeapYear(int year)    
{return (((year%4)==0 && (year%100)!=0) || ((year%400)==0));}    
    
void leapyear()    
{    
    int y,k=1;char yn;    
    while(k)    
    {    
        printf("请输入要查询的年份:\n");    
        scanf("%d",&y);    
        if(IsLeapYear(y))    
            printf("是闰年!\n");    
        else    
        printf("不是闰年!\n");    
        printf("是否继续查询(Y/N)?");    
        scanf("%c",&yn);    
        getchar();    
        if(yn=='y'||yn=='y')    
            k=1;    
        else k=0;    
    }    
}    
    
int whatisita(int y,int m)    
{    
    int n,i,sum;    
    int a[13]={0,31,28,31,30,31,30,31,31,30,31,30,31},s=0;    
    for(i=1;i<m;i++)    
        s=s+a[i];    
    if(IsLeapYear(y) && m>2)    
        s=s+i;    
        n=(y-1+(y-1)/4-(y-1)/100+(y-1)/400+sum)&7;    
    return n;    
}    
    
void printyearday()    
{    
    int y,value,sum,i,k=1;    
    char yn;    
    while(k)    
    {    
        printf("请输入查询日历的年份\n:");    
        scanf("%d",&y);    
        for(i=1;i<=12;i++)    
        {    
            printf("%d年%d月的信息:\n",y,i);    
            value=whatisita(y,i);    
            sum=everymonth(y,i);    
            printmonth(value,sum);    
            printf("\n");    
        }    
        printf("是否继续查询(Y/N)?");    
        scanf("%c",&yn);    
        getchar();    
        if(yn=='y'||yn=='y')    
            k=1;    
        else k=0;    
    }    
}    
    
int everymonth(int year,int month)    
{    
    int s,i;    
    static int a[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};    
    s=a[month];    
    if(IsLeapYear(year)&&month==2)    
        s=s+i;    
    return s;    
}    
    
void printmonthday()    
{    
    int y,m,value,k=1;char yn;    
    while(k)    
    {    
        printf("请输入查询的年份,月份\n:");    
        scanf("%d,%d",&y,&m);    
        value=everymonth(y,m);    
        printf("%d年%d月的最大天数为%d:\n",y,m,value);    
        printf("%c",&yn);getchar();    
        if(yn=='y'||yn=='y')    
            k=1;    
        else k=0;    
    }    
}    
    
void printmonth(int value,int sum)    
{    
    int n,i=0,j;    
    char*x[7]={"Sunday","Monday","Tuesday","Wenesday","Tursday",    
               "Friday","Saturday"};    
    for(j=0;j<7;j++)    
    {    
        printf("%s",x[j]);    
    }    
    printf("\n");    
    while(i<value)    
    {    
        printf(" ");    
        i++;    
    }    
    for(n=1;n<=7-value;n++)    
    printf("    %d",n);    
    while(n<=sum)    
    {    
        if((n+value-1)%7==0)    
        printf("\n");    
        if(n/10>0)    
        printf("    %d",n);    
        else    
        printf("    %d",n);    
        n++;    
    }    
}

总结：编写万年历这个程序的时候应注意把前面的/*自定义函数说明*/ 都写上，不然实现不了该相关程序的运行，另外万年历这个程序比较复杂，编写的时候应该要细心留意每一步的编写，细中求细。